Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Balance Sheet Location (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Balance Sheet Location (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Financial Assets:    
Held-to-maturity securities $ 7,815 $ 8,861
Loans held for sale [1] 1,537 1,275
Net loans and direct financing leases 78,527 79,794
Derivatives 1,013 1,057
Derivative Asset, Fair Value, Gross Asset 1,829 1,946
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (816) (889)
Financial Liabilities:    
Deposits 102,184 98,948
Short-term borrowings 219 183
Long-term borrowings 7,210 8,352
Derivatives 171 116
Derivative Liability, Fair Value, Gross Liability 874 1,033
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (703) (917)
Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 8,641 6,712
Trading account securities 51 62
Available-for-sale securities 19,375 16,485
Held-to-maturity securities 7,815 8,861
Other Securities 411 418
Loans held for sale 1,537 1,275
Net loans and direct financing leases 78,527 79,794
Derivatives 1,013 1,057
Financial Liabilities:    
Deposits 102,184 98,948
Short-term borrowings 219 183
Long-term borrowings 7,210 8,352
Derivatives 171 116
Estimate of Fair Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 8,641 6,712
Trading account securities 51 62
Available-for-sale securities 19,375 16,485
Held-to-maturity securities 8,062 9,255
Other Securities 411 418
Loans held for sale 1,537 1,275
Other securities (2) 59 59
Net loans and direct financing leases 78,603 80,477
Derivatives 1,013 1,057
Financial Liabilities:    
Deposits 102,231 99,021
Short-term borrowings 219 183
Long-term borrowings 7,305 8,568
Derivatives 171 116
Estimate of Fair Value Measurement [Member] | Level 1    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 5 5
Held-to-maturity securities 0 0
Loans held for sale 0 0
Other securities (2) 42 59
Net loans and direct financing leases 0 0
Financial Liabilities:    
Deposits 0 0
Short-term borrowings 0 0
Long-term borrowings 0 0
Estimate of Fair Value Measurement [Member] | Level 2    
Financial Assets:    
Trading account securities 51 62
Available-for-sale securities 16,242 13,510
Held-to-maturity securities 8,062 9,255
Loans held for sale 1,531 1,198
Other securities (2) 17 0
Net loans and direct financing leases 96 71
Derivative Asset, Fair Value, Gross Asset 1,808 1,903
Financial Liabilities:    
Deposits 99,998 96,656
Short-term borrowings 219 183
Long-term borrowings 6,736 7,999
Derivative Liability, Fair Value, Gross Liability 863 1,031
Estimate of Fair Value Measurement [Member] | Level 3    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 3,128 2,970
Held-to-maturity securities 0 0
Loans held for sale 6 77
Other securities (2) 0 0
Net loans and direct financing leases 78,507 80,406
Derivative Asset, Fair Value, Gross Asset 21 43
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset 816 889
Financial Liabilities:    
Deposits 2,233 2,365
Short-term borrowings 0 0
Long-term borrowings 569 569
Derivative Liability, Fair Value, Gross Liability 11 2
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (703) (917)
Fair Value, Recurring [Member]    
Financial Assets:    
Trading account securities 51  
Available-for-sale securities 19,375 16,485
Derivatives 1,013 1,057
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (816) (889)
Financial Liabilities:    
Derivatives 171 116
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (703) (917)
Fair Value, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities 0  
Available-for-sale securities 5 5
Derivative Asset, Fair Value, Gross Asset 0 0
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 0 0
Fair Value, Recurring [Member] | Level 2    
Financial Assets:    
Trading account securities 51  
Available-for-sale securities 16,242 13,510
Derivative Asset, Fair Value, Gross Asset 1,808 1,903
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 863 1,031
Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities 0  
Available-for-sale securities 3,128 2,970
Derivative Asset, Fair Value, Gross Asset 21 43
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 11 2
Other securities | Fair Value, Recurring [Member]    
Financial Assets:    
Available-for-sale securities 4 4
Other securities | Fair Value, Recurring [Member] | Level 1    
Financial Assets:    
Available-for-sale securities 0 0
Other securities | Fair Value, Recurring [Member] | Level 2    
Financial Assets:    
Available-for-sale securities 4 4
Other securities | Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Available-for-sale securities 0 0
Amortized Cost [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 8,641 6,712
Held-to-maturity securities 7,815 8,861
Other Securities 352 359
Net loans and direct financing leases 78,409 79,700
Financial Liabilities:    
Deposits 102,184 98,948
Short-term borrowings 219 183
Long-term borrowings 7,210 8,352
Fair Value Fair Value Option [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Trading account securities 51 62
Available-for-sale securities 19,375 16,485
Other Securities 59 59
Loans held for sale 1,531 1,198
Net loans and direct financing leases 118 94
Derivatives 1,013 1,057
Financial Liabilities:    
Derivatives 171 116
LowerOfCostOrMarket [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Loans held for sale $ 6 $ 77
[1] Amounts represent loans for which Huntington has elected the fair value option. See Note 11 “Fair Values of Assets and Liabilities”.