Annual report pursuant to Section 13 and 15(d)

ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)

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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Huntington Bancshares Inc shareholders’ equity $ 19,297 $ 12,993    
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
ALLL balance, beginning of period 1,814 783 $ 772  
Loan and lease charge-offs (382) (540) (362)  
Recoveries of loans and leases previously charged-off 167 91 97  
Provision for loan and lease losses (1) 1,089 277  
Allowance on PCD loans and leases at acquisition 432      
Allowance for loans sold or transferred to loans held for sale     (1)  
ALLL balance, end of period 2,030 1,814 783  
AULC balance, beginning of period 52 104 96  
Provision (benefit) for unfunded lending commitments 26 (41) 10  
Unfunded lending commitment losses (1) (13) (2)  
Cumulative-effect of change in accounting principle for financial instruments - credit losses 2,030 1,814    
AULC balance, end of period 77 52 104  
ACL balance, end of period 2,107 1,866 887  
Allowance for credit loss, change since adoption 241      
Charge-offs recognized upon completion of business acquisition 80      
ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Cumulative-effect of change in accounting principle for financial instruments - credit losses     391  
ASU 2016-13 | Retained Earnings        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Huntington Bancshares Inc shareholders’ equity       $ 306
Cumulative effect of new accounting principle, deferred taxes       87
Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
ALLL balance, beginning of period 1,236 552 542  
Loan and lease charge-offs (243) (374) (165)  
Recoveries of loans and leases previously charged-off 83 32 40  
Provision for loan and lease losses 12 846 135  
Allowance on PCD loans and leases at acquisition 374      
Allowance for loans sold or transferred to loans held for sale     0  
ALLL balance, end of period 1,462 1,236 552  
AULC balance, beginning of period 34 102 94  
Provision (benefit) for unfunded lending commitments 8 (17) 10  
Unfunded lending commitment losses (1) (13) (2)  
AULC balance, end of period 41 34 102  
ACL balance, end of period 1,503 1,270 654  
Commercial | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Cumulative-effect of change in accounting principle for financial instruments - credit losses     180  
Consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
ALLL balance, beginning of period 578 231 230  
Loan and lease charge-offs (139) (166) (197)  
Recoveries of loans and leases previously charged-off 84 59 57  
Provision for loan and lease losses (13) 243 142  
Allowance on PCD loans and leases at acquisition 58      
Allowance for loans sold or transferred to loans held for sale     (1)  
ALLL balance, end of period 568 578 231  
AULC balance, beginning of period 18 2 2  
Provision (benefit) for unfunded lending commitments 18 (24) 0  
Unfunded lending commitment losses 0 0 0  
AULC balance, end of period 36 18 2  
ACL balance, end of period $ 604 $ 596 233  
Consumer | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Cumulative-effect of change in accounting principle for financial instruments - credit losses     211  
Cumulative-effect of change in accounting principle, net of tax        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, allowance for credit loss, including off balance sheet credit loss liability       393
Financing receivable, allowance for credit loss, off balance sheet credit loss liability       2
Cumulative-effect of change in accounting principle, net of tax | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Cumulative-effect of change in accounting principle for financial instruments - credit losses     2  
Cumulative-effect of change in accounting principle, net of tax | Commercial | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Cumulative-effect of change in accounting principle for financial instruments - credit losses     (38)  
Cumulative-effect of change in accounting principle, net of tax | Consumer | ASU 2016-13        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Cumulative-effect of change in accounting principle for financial instruments - credit losses     $ 40  
Cumulative Effect Period Of Adoption Adjustment Member [Member] | Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, allowance for credit loss, including off balance sheet credit loss liability       (180)
Cumulative Effect Period Of Adoption Adjustment Member [Member] | Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing receivable, allowance for credit loss, including off balance sheet credit loss liability       $ (211)