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, 2019
Dec. 31, 2018
Financial Assets:    
Trading account securities $ 166 $ 105
Debt Securities, Held-to-maturity 8,747 8,565
Loans held for sale [1] 693 804
Net loans and direct financing leases 74,315 74,128
Derivatives 263 209
Financial Liabilities:    
Deposits (includes $845 and $872 respectively, classified as held-for-sale) 82,155 84,774
Short-term borrowings 2,862 2,017
Long-term borrowings 9,400 8,625
Derivatives 87 187
Reported Value Measurement [Member]    
Financial Assets:    
Available-for-sale securities   13,780
Other Securities 486 565
Financial Liabilities:    
Short-term borrowings 2,862  
Long-term borrowings 9,400  
Derivatives   187
Estimate of Fair Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 1,483  
Trading account securities 166 105
Available-for-sale securities 13,982 13,780
Debt Securities, Held-to-maturity 8,591 8,286
Other Securities 486 565
Loans held for sale 696 806
Other securities (1) 23 22
Net loans and direct financing leases 74,160 73,668
Financial Liabilities:    
Deposits (includes $845 and $872 respectively, classified as held-for-sale) 82,130 84,731
Short-term borrowings 2,862 2,017
Long-term borrowings 9,610 8,718
Estimate of Fair Value Measurement [Member] | Level 1    
Financial Assets:    
Trading account securities 77 78
Available-for-sale securities 5 5
Debt Securities, Held-to-maturity 0 0
Loans held for sale 0  
Other securities (1) 23 22
Net loans and direct financing leases 0 0
Financial Liabilities:    
Deposits (includes $845 and $872 respectively, classified as held-for-sale) 0 0
Short-term borrowings 2 1
Long-term borrowings 0 0
Estimate of Fair Value Measurement [Member] | Level 2    
Financial Assets:    
Trading account securities 89 27
Available-for-sale securities 10,740 10,610
Debt Securities, Held-to-maturity 8,591 8,286
Loans held for sale 523 613
Other securities (1) 0 0
Net loans and direct financing leases 50 49
Financial Liabilities:    
Deposits (includes $845 and $872 respectively, classified as held-for-sale) 74,859 76,922
Short-term borrowings 0 0
Long-term borrowings 9,016 8,158
Estimate of Fair Value Measurement [Member] | Level 3    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 3,237 3,165
Debt Securities, Held-to-maturity 0 0
Loans held for sale 173 193
Other securities (1) 0 0
Net loans and direct financing leases 74,110 73,619
Financial Liabilities:    
Deposits (includes $845 and $872 respectively, classified as held-for-sale) 7,271 7,809
Short-term borrowings 2,860 2,016
Long-term borrowings 594 560
Fair Value, Measurements, Recurring [Member]    
Financial Assets:    
Trading account securities 166 105
Available-for-sale securities 13,982 13,780
Derivatives 263 209
Financial Liabilities:    
Derivatives 87 187
Fair Value, Measurements, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities 77 78
Available-for-sale securities 5 5
Fair Value, Measurements, Recurring [Member] | Level 2    
Financial Assets:    
Trading account securities 89 27
Available-for-sale securities 10,740 10,610
Fair Value, Measurements, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 3,237 3,165
Other securities | Fair Value, Measurements, Recurring [Member]    
Financial Assets:    
Trading account securities 78 77
Available-for-sale securities 4 4
Other securities | Fair Value, Measurements, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities 77 77
Available-for-sale securities 0 0
Other securities | Fair Value, Measurements, Recurring [Member] | Level 2    
Financial Assets:    
Trading account securities 1 0
Available-for-sale securities 4 4
Other securities | Fair Value, Measurements, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 0 0
Amortized Cost [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Cash and short term assets 1,483 2,725
Debt Securities, Held-to-maturity 8,747 8,565
Other Securities 463 543
Financial Liabilities:    
Deposits (includes $845 and $872 respectively, classified as held-for-sale) 82,155 84,774
Short-term borrowings 2,862 2,017
Long-term borrowings 9,400 8,625
Fair Value Fair Value Option [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Trading account securities 166 105
Available-for-sale securities 13,982 13,780
Other Securities 23 22
Loans held for sale 523 613
Derivatives 263 209
Financial Liabilities:    
Derivatives 87 187
LowerOfCostOrMarket [Member] | Reported Value Measurement [Member]    
Financial Assets:    
Loans held for sale $ 170 $ 191
[1] Amounts represent loans for which Huntington has elected the fair value option.