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
Sep. 30, 2021
Dec. 31, 2020
Financial Assets:    
Fair Value $ 25,654 $ 16,485
Held-to-maturity securities 12,455 8,861
Loans held for sale [1] 1,335 1,275
Net loans and direct financing leases 108,460 79,794
Derivatives 900 1,057
Derivative Asset, Fair Value, Gross Asset 1,586 1,946
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (686) (889)
Financial Liabilities:    
Total deposits 141,898 98,948
Short-term borrowings 435 183
Long-term borrowings 7,779 8,352
Derivatives 250 116
Derivative Liability, Fair Value, Gross Liability 1,063 1,033
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (813) (917)
Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 10,188 6,712
Trading account securities 77 62
Fair Value 25,654 16,485
Held-to-maturity securities 12,455 8,861
Other Securities 649 418
Loans held for sale 1,335 1,275
Net loans and direct financing leases 108,460 79,794
Derivatives 900 1,057
Assets Held-in-trust, Current 151 73
Financial Liabilities:    
Total deposits 141,898 98,948
Short-term borrowings 435 183
Long-term borrowings 7,779 8,352
Derivatives 250 116
Estimate of Fair Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 10,188 6,712
Trading account securities 77 62
Fair Value 25,654 16,485
Held-to-maturity securities 12,619 9,255
Other Securities 649 418
Loans held for sale 1,335 1,275
Other securities (2) 86 59
Net loans and direct financing leases 108,385 80,477
Derivatives 900 1,057
Assets Held-in-trust, Current 151 73
Financial Liabilities:    
Total deposits 142,261 99,021
Short-term borrowings 435 183
Long-term borrowings 7,908 8,568
Derivatives 250 116
Estimate of Fair Value Measurement [Member] | Level 1    
Financial Assets:    
Trading account securities 0 0
Fair Value 5 5
Held-to-maturity securities 0 0
Loans held for sale 0 0
Other securities (2) 62 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 77 62
Fair Value 22,014 13,510
Held-to-maturity securities 12,619 9,255
Loans held for sale 1,297 1,198
Other securities (2) 24 0
Net loans and direct financing leases 119 71
Derivative Asset, Fair Value, Gross Asset 1,567 1,903
Financial Liabilities:    
Total deposits 137,142 96,656
Short-term borrowings 435 183
Long-term borrowings 7,147 7,999
Derivative Liability, Fair Value, Gross Liability 1,056 1,031
Estimate of Fair Value Measurement [Member] | Level 3    
Financial Assets:    
Trading account securities 0 0
Fair Value 3,635 2,970
Held-to-maturity securities 0 0
Loans held for sale 38 77
Other securities (2) 0 0
Net loans and direct financing leases 108,266 80,406
Derivative Asset, Fair Value, Gross Asset 19 43
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset 686 889
Financial Liabilities:    
Total deposits 5,119 2,365
Short-term borrowings 0 0
Long-term borrowings 761 569
Derivative Liability, Fair Value, Gross Liability 7 2
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (813) (917)
Fair Value, Recurring [Member]    
Financial Assets:    
Trading account securities 77  
Fair Value 25,654 16,485
Derivatives 900 1,057
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (686) (889)
Financial Liabilities:    
Derivatives 250 116
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (813) (917)
Fair Value, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities 0  
Fair Value 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 77  
Fair Value 22,014 13,510
Derivative Asset, Fair Value, Gross Asset 1,567 1,903
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 1,056 1,031
Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities 0  
Fair Value 3,635 2,970
Derivative Asset, Fair Value, Gross Asset 19 43
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 7 2
Other securities | Fair Value, Recurring [Member]    
Financial Assets:    
Fair Value 4 4
Other securities | Fair Value, Recurring [Member] | Level 1    
Financial Assets:    
Fair Value 0 0
Other securities | Fair Value, Recurring [Member] | Level 2    
Financial Assets:    
Fair Value 4 4
Other securities | Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Fair Value 0 0
Amortized Cost [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 10,188 6,712
Held-to-maturity securities 12,455 8,861
Other Securities 563 359
Net loans and direct financing leases 108,321 79,700
Financial Liabilities:    
Total deposits 141,898 98,948
Short-term borrowings 435 183
Long-term borrowings 7,779 8,352
Fair Value Fair Value Option [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Trading account securities 77 62
Fair Value 25,654 16,485
Other Securities 86 59
Loans held for sale 1,297 1,198
Net loans and direct financing leases 139 94
Derivatives 900 1,057
Assets Held-in-trust, Current 151 73
Financial Liabilities:    
Derivatives 250 116
LowerOfCostOrMarket [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Loans held for sale $ 38 $ 77
[1] Amounts represent loans for which Huntington has elected the fair value option. See Note 13 “Fair Values of Assets and Liabilities”.