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, 2020
Dec. 31, 2019
Financial Assets:    
Held-to-maturity securities $ 8,557 $ 9,070
Loans held for sale [1] 1,303 877
Net loans and direct financing leases 79,360 74,621
Derivatives 1,088 452
Derivative Asset, Fair Value, Gross Asset 2,143 856
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (1,055) (404)
Financial Liabilities:    
Deposits 95,154 82,347
Short-term borrowings 222 2,606
Long-term borrowings 9,174 9,849
Derivatives 110 104
Derivative Liability, Fair Value, Gross Liability 1,172 521
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (1,062) (417)
Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 6,384 1,272
Trading account securities 54 99
Available-for-sale securities 14,807 14,149
Held-to-maturity securities 8,557 9,070
Other Securities 421 441
Loans held for sale 1,303 877
Net loans and direct financing leases 79,360 74,621
Derivatives 1,088 452
Financial Liabilities:    
Deposits 95,154 82,347
Short-term borrowings 222 2,606
Long-term borrowings 9,174 9,849
Derivatives 110 104
Estimate of Fair Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 6,384 1,272
Trading account securities 54 99
Available-for-sale securities 14,807 14,149
Held-to-maturity securities 8,970 9,186
Other Securities 421 441
Loans held for sale 1,308 879
Other securities (2) 58 54
Net loans and direct financing leases 80,490 75,177
Derivatives 1,088 452
Financial Liabilities:    
Deposits 95,350 82,344
Short-term borrowings 222 2,606
Long-term borrowings 9,440 10,075
Derivatives 110 104
Estimate of Fair Value Measurement [Member] | Level 1    
Financial Assets:    
Trading account securities 0 30
Available-for-sale securities 5 10
Held-to-maturity securities 0 0
Loans held for sale 0 0
Other securities (2) 58 54
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 54 69
Available-for-sale securities 11,659 11,090
Held-to-maturity securities 8,970 9,186
Loans held for sale 1,118 781
Other securities (2) 0 0
Net loans and direct financing leases 68 55
Derivative Asset, Fair Value, Gross Asset 2,093 848
Financial Liabilities:    
Deposits 92,779 76,790
Short-term borrowings 0 0
Long-term borrowings 8,877 9,439
Derivative Liability, Fair Value, Gross Liability 1,170 519
Estimate of Fair Value Measurement [Member] | Level 3    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 3,143 3,049
Held-to-maturity securities 0 0
Loans held for sale 190 98
Other securities (2) 0 0
Net loans and direct financing leases 80,422 75,122
Derivative Asset, Fair Value, Gross Asset 50 8
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset 1,055 404
Financial Liabilities:    
Deposits 2,571 5,554
Short-term borrowings 222 2,606
Long-term borrowings 563 636
Derivative Liability, Fair Value, Gross Liability 2 2
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (1,062) (417)
Fair Value, Recurring [Member]    
Financial Assets:    
Trading account securities   99
Available-for-sale securities 14,807 14,149
Derivatives 1,088 452
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset (1,055) (404)
Financial Liabilities:    
Derivatives 110 104
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset (1,062) (417)
Fair Value, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities   30
Available-for-sale securities 5 10
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   69
Available-for-sale securities 11,659 11,090
Derivative Asset, Fair Value, Gross Asset 2,093 848
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 1,170 519
Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities   0
Available-for-sale securities 3,143 3,049
Derivative Asset, Fair Value, Gross Asset 50 8
Financial Liabilities:    
Derivative Liability, Fair Value, Gross Liability 2 2
Other securities | Fair Value, Recurring [Member]    
Financial Assets:    
Trading account securities   32
Available-for-sale securities 4 4
Other securities | Fair Value, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities   30
Available-for-sale securities 0 0
Other securities | Fair Value, Recurring [Member] | Level 2    
Financial Assets:    
Trading account securities   2
Available-for-sale securities 4 4
Other securities | Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities   0
Available-for-sale securities 0 0
Amortized Cost [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 6,384 1,272
Held-to-maturity securities 8,557 9,070
Other Securities 363 387
Net loans and direct financing leases 79,268 74,540
Financial Liabilities:    
Deposits 95,154 82,347
Short-term borrowings 222 2,606
Long-term borrowings 9,174 9,849
Fair Value Fair Value Option [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Trading account securities 54 99
Available-for-sale securities 14,807 14,149
Other Securities 58 54
Loans held for sale 1,118 781
Net loans and direct financing leases 92 81
Derivatives 1,088 452
Financial Liabilities:    
Derivatives 110 104
LowerOfCostOrMarket [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Loans held for sale $ 185 $ 96
[1] Amounts represent loans for which Huntington has elected the fair value option. See Note 12 “Fair Values of Assets and Liabilities”.