Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Non-Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale [1] $ 1,391 $ 1,275
Long-term debt 7,342 8,352
Amortized Cost (1) 11,415 8,861
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 109,687 79,794
Loans Held-for-sale, Fair Value Disclosure (1,141) (1,198)
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 93 62
Loans held for sale 1,393 1,275
Available-for-sale securities 22,915 16,485
Long-term debt 7,433 8,568
Amortized Cost (1) 11,641 9,255
Other Securities 692 418
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 109,878 80,477
Level 1 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 0 0
Loans held for sale 0 0
Available-for-sale securities 5 5
Long-term debt 0 0
Amortized Cost (1) 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 0 0
Level 2 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 93 62
Loans held for sale 1,141 1,198
Available-for-sale securities 19,237 13,510
Long-term debt 6,655 7,999
Amortized Cost (1) 11,641 9,255
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 110 71
Level 3 | Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Trading, and Equity Securities, FV-NI 0 0
Loans held for sale 252 77
Available-for-sale securities 3,673 2,970
Long-term debt 778 569
Amortized Cost (1) 0 0
Assets measured at fair value on a nonrecurring basis    
Net loans and direct financing leases 109,768 80,406
Nonrecurring Basis    
Assets measured at fair value on a nonrecurring basis    
Collateral-dependent loans   $ (144)
Nonrecurring Basis | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Collateral-dependent loans (17)  
Loans Held-for-sale, Fair Value Disclosure (15)  
Nonrecurring Basis | Total Gains/(Losses)    
Assets measured at fair value on a nonrecurring basis    
Collateral-dependent loans (2)  
Loans Held-for-sale, Fair Value Disclosure 2  
Nonrecurring Basis | Level 1 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Collateral-dependent loans 0  
Nonrecurring Basis | Level 2 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Collateral-dependent loans 0  
Nonrecurring Basis | Level 3 | Fair Value    
Assets measured at fair value on a nonrecurring basis    
Collateral-dependent loans (17)  
Loans Held-for-sale, Fair Value Disclosure $ (15)  
[1] Amounts represent loans for which Huntington has elected the fair value option. See Note 13 “Fair Values of Assets and Liabilities”.