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, 2019
Dec. 31, 2018
Dec. 31, 2016
Financial Assets:      
Trading account securities $ 176 $ 105  
Debt Securities, Held-to-maturity 8,704 8,565  
Loans held for sale [1] 778 804  
Net loans and direct financing leases 74,259 74,128  
Derivatives 433 209  
Financial Liabilities:      
Deposits (includes $0 and $872 respectively, classified as held-for-sale) 80,882 84,774  
Short-term borrowings 4,161 2,017  
Long-term borrowings 8,973 8,625  
Derivatives 117 187  
Reported Value Measurement [Member]      
Financial Assets:      
Cash and short term assets 1,747 2,725  
Trading account securities 176 105  
Available-for-sale securities 13,695 13,780  
Debt Securities, Held-to-maturity 8,704   $ 8,565
Other Securities 440 565  
Loans held for sale 778   804
Net loans and direct financing leases 74,259 74,128  
Derivatives 433 209  
Financial Liabilities:      
Deposits (includes $0 and $872 respectively, classified as held-for-sale) 80,882 84,774  
Short-term borrowings 4,161 2,017  
Long-term borrowings 8,973 8,625  
Derivatives 117 187  
Estimate of Fair Value Measurement [Member]      
Financial Assets:      
Cash and short term assets 1,747   2,725
Trading account securities 176 105  
Available-for-sale securities 13,695 13,780 13,780
Debt Securities, Held-to-maturity 8,748 8,286  
Other Securities 440 565  
Loans held for sale 781 806 806
Other securities (1) 14 22  
Net loans and direct financing leases 74,775 73,668  
Derivatives 433 209  
Financial Liabilities:      
Deposits (includes $0 and $872 respectively, classified as held-for-sale) 80,890 84,731 84,731
Short-term borrowings 4,161 2,017  
Long-term borrowings 9,180 8,718 8,718
Derivatives 117   $ 187
Estimate of Fair Value Measurement [Member] | Level 1      
Financial Assets:      
Trading account securities 68 78  
Available-for-sale securities 11 5  
Debt Securities, Held-to-maturity 0 0  
Loans held for sale 0 0  
Other securities (1) 14 22  
Net loans and direct financing leases 0 0  
Financial Liabilities:      
Deposits (includes $0 and $872 respectively, classified as held-for-sale) 0 0  
Short-term borrowings 0 1  
Long-term borrowings 0 0  
Estimate of Fair Value Measurement [Member] | Level 2      
Financial Assets:      
Trading account securities 108 27  
Available-for-sale securities 10,482 10,610  
Debt Securities, Held-to-maturity 8,748 8,286  
Loans held for sale 736 613  
Other securities (1) 0 0  
Net loans and direct financing leases 78 49  
Financial Liabilities:      
Deposits (includes $0 and $872 respectively, classified as held-for-sale) 73,905 76,922  
Short-term borrowings 4,161 0  
Long-term borrowings 8,609 8,158  
Estimate of Fair Value Measurement [Member] | Level 3      
Financial Assets:      
Trading account securities 0 0  
Available-for-sale securities 3,202 3,165  
Debt Securities, Held-to-maturity 0 0  
Loans held for sale 45 193  
Other securities (1) 0 0  
Net loans and direct financing leases 74,697 73,619  
Financial Liabilities:      
Deposits (includes $0 and $872 respectively, classified as held-for-sale) 6,985 7,809  
Short-term borrowings 0 2,016  
Long-term borrowings 571 560  
Fair Value, Measurements, Recurring [Member]      
Financial Assets:      
Trading account securities 176 105  
Available-for-sale securities 13,695 13,780  
Derivatives 433 209  
Financial Liabilities:      
Derivatives 117 187  
Fair Value, Measurements, Recurring [Member] | Level 1      
Financial Assets:      
Trading account securities 68 78  
Available-for-sale securities 11 5  
Fair Value, Measurements, Recurring [Member] | Level 2      
Financial Assets:      
Trading account securities 108 27  
Available-for-sale securities 10,482 10,610  
Fair Value, Measurements, Recurring [Member] | Level 3      
Financial Assets:      
Trading account securities 0 0  
Available-for-sale securities 3,202 3,165  
Other securities | Fair Value, Measurements, Recurring [Member]      
Financial Assets:      
Trading account securities 68 77  
Available-for-sale securities 5 4  
Other securities | Fair Value, Measurements, Recurring [Member] | Level 1      
Financial Assets:      
Trading account securities 68 77  
Available-for-sale securities 0 0  
Other securities | Fair Value, Measurements, Recurring [Member] | Level 2      
Financial Assets:      
Trading account securities 0 0  
Available-for-sale securities 5 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 1,747 2,725  
Debt Securities, Held-to-maturity 8,704 8,565  
Other Securities 426 543  
Net loans and direct financing leases 74,181 74,049  
Financial Liabilities:      
Deposits (includes $0 and $872 respectively, classified as held-for-sale) 80,882 84,774  
Short-term borrowings 4,161 2,017  
Long-term borrowings 8,973 8,625  
Fair Value Fair Value Option [Member] | Reported Value Measurement [Member]      
Financial Assets:      
Trading account securities 176 105  
Available-for-sale securities 13,695 13,780  
Other Securities 14 22  
Loans held for sale 736 613  
Net loans and direct financing leases 78 79  
Derivatives 433 209  
Financial Liabilities:      
Derivatives 117 187  
LowerOfCostOrMarket [Member] | Reported Value Measurement [Member]      
Financial Assets:      
Loans held for sale $ 42 $ 191  
[1] Amounts represent loans for which Huntington has elected the fair value option.