Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Schedule of Long-Term Debt and Debt Issuances (Details)

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BORROWINGS - Schedule of Long-Term Debt and Debt Issuances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Long-term debt $ 12,394 $ 9,686
Senior Notes | 3.60% Huntington National Bank senior notes due 2023    
Debt Instrument [Line Items]    
Long-term debt $ 0 735
Effective rate 3.60%  
Senior Notes | 6.66% Huntington National Bank senior notes due 2025    
Debt Instrument [Line Items]    
Long-term debt $ 278 299
Effective rate 6.66%  
Senior Notes | 4.11% Huntington National Bank senior notes due 2025    
Debt Instrument [Line Items]    
Long-term debt $ 467 486
Effective rate 4.11%  
Senior Notes | 5.81% Huntington National Bank senior notes due 2025    
Debt Instrument [Line Items]    
Long-term debt $ 1,060 1,094
Effective rate 5.81%  
Senior Notes | 4.55% Huntington National Bank senior notes due 2028    
Debt Instrument [Line Items]    
Long-term debt $ 776 766
Effective rate 4.55%  
Senior Notes | 5.76% Huntington National Bank senior notes due 2030    
Debt Instrument [Line Items]    
Long-term debt $ 899 892
Effective rate 5.76%  
Subordinated Notes    
Debt Instrument [Line Items]    
Long-term debt $ 4,142 4,923
Subordinated Notes | Huntington National Bank subordinated notes due 2025    
Debt Instrument [Line Items]    
Long-term debt $ 129 129
Effective rate 0.96%  
Subordinated Notes | Huntington National Bank subordinated notes due 2026    
Debt Instrument [Line Items]    
Long-term debt $ 223 218
Effective rate 3.86%  
Subordinated Notes | Huntington National Bank subordinated notes due 2029    
Debt Instrument [Line Items]    
Long-term debt $ 156 153
Effective rate 3.03%  
Subordinated Notes | Huntington National Bank subordinated notes due 2030    
Debt Instrument [Line Items]    
Long-term debt $ 154 151
Effective rate 3.75%  
Federal Home Loan Bank advances    
Debt Instrument [Line Items]    
Long-term debt $ 2,731 211
Effective rate 4.21%  
Other borrowings | Huntington Technology Finance nonrecourse debt, 5.38% weighted average interest rate, varying maturities    
Debt Instrument [Line Items]    
Long-term debt $ 343 337
Effective rate 5.38%  
Other borrowings | 6.65% Huntington Preferred Capital II - Class G securities    
Debt Instrument [Line Items]    
Long-term debt $ 0 50
Effective rate 6.65%  
Other borrowings | Huntington Preferred Capital II - Class I securities    
Debt Instrument [Line Items]    
Long-term debt $ 50 50
Effective rate 7.64%  
Other borrowings | Huntington Preferred Capital II - Class J securities    
Debt Instrument [Line Items]    
Long-term debt $ 75 75
Effective rate 8.24%  
Other borrowings | Huntington Preferred Capital II - Class L securities    
Debt Instrument [Line Items]    
Long-term debt $ 60 60
Effective rate 8.74%  
Parent Company    
Debt Instrument [Line Items]    
Long-term debt $ 4,993 3,980
Parent Company | Senior Notes | 2.67% Huntington Bancshares Incorporated senior notes due 2024    
Debt Instrument [Line Items]    
Long-term debt $ 719 762
Effective rate 2.67%  
Parent Company | Senior Notes | 4.05% Huntington Bancshares Incorporated senior notes due 2025    
Debt Instrument [Line Items]    
Long-term debt $ 457 481
Effective rate 4.05%  
Parent Company | Senior Notes | 4.51% Huntington Bancshares Incorporated senior notes due 2028    
Debt Instrument [Line Items]    
Long-term debt $ 716 704
Effective rate 4.51%  
Parent Company | Senior Notes | 6.29% Huntington Bancshares Incorporated senior notes due 2029    
Debt Instrument [Line Items]    
Long-term debt $ 1,266 0
Effective rate 6.29%  
Parent Company | Senior Notes | 2.60% Huntington Bancshares Incorporated senior notes due 2030    
Debt Instrument [Line Items]    
Long-term debt $ 692 679
Effective rate 2.60%  
Parent Company | Senior Notes | 5.08% Huntington Bancshares Incorporated senior notes due 2033    
Debt Instrument [Line Items]    
Long-term debt $ 383 379
Effective rate 5.08%  
Parent Company | Subordinated Notes | 3.55% Huntington Bancshares Incorporated subordinated notes due 2023    
Debt Instrument [Line Items]    
Long-term debt $ 0 225
Effective rate 3.55%  
Parent Company | Subordinated Notes | Huntington Capital I Trust Preferred 6.34% junior subordinated debentures due 2027    
Debt Instrument [Line Items]    
Long-term debt $ 69 69
Effective rate 6.34%  
Parent Company | Subordinated Notes | Huntington Capital II Trust Preferred 6.27% junior subordinated debentures due 2028    
Debt Instrument [Line Items]    
Long-term debt $ 32 32
Effective rate 6.27%  
Parent Company | Subordinated Notes | Sky Financial Capital Trust III 7.04% junior subordinated debentures due 2036    
Debt Instrument [Line Items]    
Long-term debt $ 72 72
Effective rate 7.04%  
Parent Company | Subordinated Notes | Sky Financial Capital Trust IV 7.04% junior subordinated debentures due 2036    
Debt Instrument [Line Items]    
Long-term debt $ 74 74
Effective rate 7.04%  
Parent Company | Subordinated Notes | 2.49% Huntington Bancshares Incorporated subordinated notes due 2036    
Debt Instrument [Line Items]    
Long-term debt $ 1 1
Effective rate 2.49%  
Parent Company | Subordinated Notes | 2.53% Huntington Bancshares Incorporated subordinated notes due 2036    
Debt Instrument [Line Items]    
Long-term debt $ 512 $ 502
Effective rate 2.53%  
Parent Company | Subordinated Notes | SOFR | Huntington Capital I Trust Preferred 6.34% junior subordinated debentures due 2027    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.96%  
Parent Company | Subordinated Notes | SOFR | Huntington Capital II Trust Preferred 6.27% junior subordinated debentures due 2028    
Debt Instrument [Line Items]    
Basis spread on variable rate 0.866%  
Parent Company | Subordinated Notes | SOFR | Sky Financial Capital Trust III 7.04% junior subordinated debentures due 2036    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.66%  
Parent Company | Subordinated Notes | SOFR | Sky Financial Capital Trust IV 7.04% junior subordinated debentures due 2036    
Debt Instrument [Line Items]    
Basis spread on variable rate 1.66%  
Parent Company | Subordinated Notes | SOFR | Huntington Preferred Capital II - Class I securities    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%  
Parent Company | Subordinated Notes | SOFR | Huntington Preferred Capital II - Class J securities    
Debt Instrument [Line Items]    
Basis spread on variable rate 2.60%  
Parent Company | Subordinated Notes | SOFR | Huntington Preferred Capital II - Class L securities    
Debt Instrument [Line Items]    
Basis spread on variable rate 3.10%