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
Jun. 30, 2021
Dec. 31, 2020
Financial Assets:    
Held-to-maturity securities $ 11,415 $ 8,861
Loans held for sale [1] 1,391 1,275
Net loans and direct financing leases 109,687 79,794
Derivatives 952 1,057
Derivative Asset, Fair Value, Gross Asset 1,684 1,946
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (732) (889)
Financial Liabilities:    
Total deposits 142,805 98,948
Short-term borrowings 391 183
Long-term borrowings 7,342 8,352
Derivatives 173 116
Derivative Liability, Fair Value, Gross Liability 1,048 1,033
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (875) (917)
Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 13,926 6,712
Trading account securities 93 62
Available-for-sale securities 22,915 16,485
Held-to-maturity securities 11,415 8,861
Other Securities 692 418
Loans held for sale 1,391 1,275
Net loans and direct financing leases 109,687 79,794
Derivatives 952 1,057
Financial Liabilities:    
Total deposits 142,805 98,948
Short-term borrowings 391 183
Long-term borrowings 7,342 8,352
Derivatives 173 116
Estimate of Fair Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 13,926 6,712
Trading account securities 93 62
Available-for-sale securities 22,915 16,485
Held-to-maturity securities 11,641 9,255
Other Securities 692 418
Loans held for sale 1,393 1,275
Other securities (2) 66 59
Net loans and direct financing leases 109,878 80,477
Derivatives 952 1,057
Financial Liabilities:    
Total deposits 142,804 99,021
Short-term borrowings 391 183
Long-term borrowings 7,433 8,568
Derivatives 173 116
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:    
Total 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 93 62
Available-for-sale securities 19,237 13,510
Held-to-maturity securities 11,641 9,255
Loans held for sale 1,141 1,198
Other securities (2) 24 0
Net loans and direct financing leases 110 71
Derivative Asset, Fair Value, Gross Asset 1,655 1,903
Financial Liabilities:    
Total deposits 136,863 96,656
Short-term borrowings 391 183
Long-term borrowings 6,655 7,999
Derivative Liability, Fair Value, Gross Liability 1,042 1,031
Estimate of Fair Value Measurement [Member] | Level 3    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 3,673 2,970
Held-to-maturity securities 0 0
Loans held for sale 252 77
Other securities (2) 0 0
Net loans and direct financing leases 109,768 80,406
Derivative Asset, Fair Value, Gross Asset 29 43
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset 732 889
Financial Liabilities:    
Total deposits 5,941 2,365
Short-term borrowings 0 0
Long-term borrowings 778 569
Derivative Liability, Fair Value, Gross Liability 6 2
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (875) (917)
Fair Value, Recurring [Member]    
Financial Assets:    
Trading account securities 93  
Available-for-sale securities 22,915 16,485
Derivatives 952 1,057
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (732) (889)
Financial Liabilities:    
Derivatives 173 116
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (875) (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 93  
Available-for-sale securities 19,237 13,510
Derivative Asset, Fair Value, Gross Asset 1,655 1,903
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 1,042 1,031
Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities 0  
Available-for-sale securities 3,673 2,970
Derivative Asset, Fair Value, Gross Asset 29 43
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 6 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 13,926 6,712
Held-to-maturity securities 11,415 8,861
Other Securities 626 359
Net loans and direct financing leases 109,556 79,700
Financial Liabilities:    
Total deposits 142,805 98,948
Short-term borrowings 391 183
Long-term borrowings 7,342 8,352
Fair Value Fair Value Option [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Trading account securities 93 62
Available-for-sale securities 22,915 16,485
Other Securities 66 59
Loans held for sale 1,141 1,198
Net loans and direct financing leases 131 94
Derivatives 952 1,057
Financial Liabilities:    
Derivatives 173 116
LowerOfCostOrMarket [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Loans held for sale $ 250 $ 77
[1] Amounts represent loans for which Huntington has elected the fair value option. See Note 13 “Fair Values of Assets and Liabilities”.