Annual report pursuant to Section 13 and 15(d)

FAIR VALUES OF ASSETS AND LIABILITIES - Balance Sheet Location (Details) (Details)

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FAIR VALUES OF ASSETS AND LIABILITIES - Balance Sheet Location (Details) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financial Assets:    
Held-to-maturity securities $ 9,070 $ 8,565
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) 877 804
Loans and Leases Receivable, Net Amount 74,621 74,128
Derivatives 452 209
Financial Liabilities:    
Deposits 82,347 84,774
Short-term borrowings 2,606 2,017
Long-term borrowings 9,849 8,625
Derivatives 104 187
Carrying Amount    
Financial Assets:    
Cash and short term assets 1,272 2,725
Trading account securities 99 105
Available-for-sale securities 14,149 13,780
Held-to-maturity securities 9,070 8,565
Other Securities 441 565
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) 877 804
Loans and Leases Receivable, Net Amount 74,621 74,128
Derivatives 452 209
Financial Liabilities:    
Deposits 82,347 84,774
Short-term borrowings 2,606 2,017
Long-term borrowings 9,849 8,625
Derivatives 104 187
Fair Value    
Financial Assets:    
Cash and short term assets 1,272 2,725
Trading account securities 99 105
Available-for-sale securities 14,149 13,780
Held-to-maturity securities 9,186 8,286
Other Securities 441 565
Other Securities, Only Measured At Fair Value 54 22
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) 879 806
Loans and Leases Receivable, Net Amount 75,177 73,668
Derivatives 452 209
Financial Liabilities:    
Deposits 82,344 84,731
Short-term borrowings 2,606 2,017
Long-term borrowings 10,075 8,718
Derivatives 104 187
Level 1 | Fair Value    
Financial Assets:    
Trading account securities 30 78
Available-for-sale securities 10 5
Held-to-maturity securities 0 0
Other Securities, Only Measured At Fair Value 54 22
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) 0 0
Loans and Leases Receivable, Net Amount 0 0
Financial Liabilities:    
Deposits 0 0
Short-term borrowings 0 1
Long-term borrowings 0 0
Level 2 | Fair Value    
Financial Assets:    
Trading account securities 69 27
Available-for-sale securities 11,090 10,610
Held-to-maturity securities 9,186 8,286
Other Securities, Only Measured At Fair Value 0 0
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) 781 613
Loans and Leases Receivable, Net Amount 55 49
Financial Liabilities:    
Deposits 76,790 76,922
Short-term borrowings 0 0
Long-term borrowings 9,439 8,158
Level 3 | Fair Value    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 3,049 3,165
Held-to-maturity securities 0 0
Other Securities, Only Measured At Fair Value 0 0
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) 98 193
Loans and Leases Receivable, Net Amount 75,122 73,619
Financial Liabilities:    
Deposits 5,554 7,809
Short-term borrowings 2,606 2,016
Long-term borrowings 636 560
Fair Value, Recurring [Member]    
Financial Assets:    
Trading account securities 99 105
Available-for-sale securities 14,149 13,780
Derivatives 452 209
Financial Liabilities:    
Derivatives 104 187
Fair Value, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities 30 78
Available-for-sale securities 10 5
Fair Value, Recurring [Member] | Level 2    
Financial Assets:    
Trading account securities 69 27
Available-for-sale securities 11,090 10,610
Fair Value, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities   0
Available-for-sale securities 3,049 3,165
Fair Value, Recurring [Member] | Other securities/Sovereign debt    
Financial Assets:    
Trading account securities 32 77
Available-for-sale securities 4 4
Fair Value, Recurring [Member] | Other securities/Sovereign debt | Level 1    
Financial Assets:    
Trading account securities 30 77
Available-for-sale securities 0 0
Fair Value, Recurring [Member] | Other securities/Sovereign debt | Level 2    
Financial Assets:    
Trading account securities 2 0
Available-for-sale securities 4 4
Fair Value, Recurring [Member] | Other securities/Sovereign debt | Level 3    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 0 0
Amortized Cost [Member] | Carrying Amount    
Financial Assets:    
Cash and short term assets 1,272 2,725
Held-to-maturity securities 9,070 8,565
Other Securities 387 543
Loans and Leases Receivable, Net Amount 74,540 74,049
Financial Liabilities:    
Deposits 82,347 84,774
Short-term borrowings 2,606 2,017
Long-term borrowings 9,849 8,625
Fair Value Fair Value Option [Member] | Carrying Amount    
Financial Assets:    
Trading account securities 99 105
Available-for-sale securities 14,149 13,780
Other Securities 54 22
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) 781 613
Loans and Leases Receivable, Net Amount 81 79
Derivatives 452 209
Financial Liabilities:    
Derivatives 104 187
LowerOfCostOrMarket [Member] | Carrying Amount    
Financial Assets:    
Loans held for sale (includes $781 and $613 respectively, measured at fair value)(1) $ 96 $ 191