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, 2018
Dec. 31, 2017
Financial Assets:    
Trading account securities $ 105 $ 86
Held-to-maturity securities 8,565 9,091
Loans held for sale (includes $613 and $413 respectively, measured at fair value)(1) 804 488
Loans and Leases Receivable, Net Amount 74,128 69,426
Derivatives 209 132
Financial Liabilities:    
Deposits 84,774 77,041
Short-term borrowings 2,017 5,056
Long-term borrowings 8,625 9,206
Derivatives 187 86
Carrying Amount    
Financial Assets:    
Available-for-sale securities   14,869
Other Securities 565 600
Financial Liabilities:    
Short-term borrowings 2,017  
Long-term borrowings 8,625  
Derivatives   86
Fair Value    
Financial Assets:    
Cash and short term assets 2,725  
Trading account securities 105 86
Available-for-sale securities 13,780 14,869
Held-to-maturity securities 8,286 8,971
Other Securities 565 600
Other Securities, Only Measured At Fair Value 22 19
Loans held for sale (includes $613 and $413 respectively, measured at fair value)(1) 806 491
Loans and Leases Receivable, Net Amount 73,668 69,146
Financial Liabilities:    
Deposits 84,731 77,010
Short-term borrowings 2,017 5,056
Long-term borrowings 8,718 9,402
Level 1 | Fair Value    
Financial Assets:    
Trading account securities 78  
Available-for-sale securities 5 5
Held-to-maturity securities 0 0
Other Securities, Only Measured At Fair Value 22 19
Loans held for sale (includes $613 and $413 respectively, measured at fair value)(1) 0 0
Loans and Leases Receivable, Net Amount 0 0
Financial Liabilities:    
Deposits 0 0
Short-term borrowings 1 0
Long-term borrowings 0 0
Level 2 | Fair Value    
Financial Assets:    
Trading account securities 27  
Available-for-sale securities 10,610 11,673
Held-to-maturity securities 8,286 8,971
Other Securities, Only Measured At Fair Value 0 0
Loans held for sale (includes $613 and $413 respectively, measured at fair value)(1) 613 413
Loans and Leases Receivable, Net Amount 49 0
Financial Liabilities:    
Deposits 76,922 73,975
Short-term borrowings 0 0
Long-term borrowings 8,158 8,944
Level 3 | Fair Value    
Financial Assets:    
Trading account securities 0 0
Available-for-sale securities 3,165 3,191
Held-to-maturity securities 0 0
Other Securities, Only Measured At Fair Value 0 0
Loans held for sale (includes $613 and $413 respectively, measured at fair value)(1) 193 78
Loans and Leases Receivable, Net Amount 73,619 69,146
Financial Liabilities:    
Deposits 7,809 3,035
Short-term borrowings 2,016 5,056
Long-term borrowings 560 458
Fair Value, Measurements, Recurring [Member]    
Financial Assets:    
Trading account securities   86
Available-for-sale securities 13,780 14,869
Derivatives 209 132
Financial Liabilities:    
Derivatives 187 86
Fair Value, Measurements, Recurring [Member] | Level 1    
Financial Assets:    
Trading account securities   83
Available-for-sale securities 5 5
Fair Value, Measurements, Recurring [Member] | Level 2    
Financial Assets:    
Trading account securities   3
Available-for-sale securities 10,610 11,673
Fair Value, Measurements, Recurring [Member] | Level 3    
Financial Assets:    
Trading account securities   0
Available-for-sale securities 3,165 3,191
Fair Value, Measurements, Recurring [Member] | Other securities/Sovereign debt    
Financial Assets:    
Trading account securities 77 86
Available-for-sale securities 4 2
Fair Value, Measurements, Recurring [Member] | Other securities/Sovereign debt | Level 1    
Financial Assets:    
Trading account securities 77 83
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring [Member] | Other securities/Sovereign debt | Level 2    
Financial Assets:    
Trading account securities 0 3
Available-for-sale securities 4 2
Fair Value, Measurements, 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 2,725 1,567
Held-to-maturity securities 8,565 9,091
Other Securities 543 581
Loans and Leases Receivable, Net Amount   69,333
Financial Liabilities:    
Deposits 84,774 77,041
Short-term borrowings 2,017 5,056
Long-term borrowings 8,625 9,206
Fair Value Fair Value Option [Member] | Carrying Amount    
Financial Assets:    
Trading account securities 105 86
Available-for-sale securities 13,780 14,869
Other Securities 22 19
Loans held for sale (includes $613 and $413 respectively, measured at fair value)(1) 613 413
Loans and Leases Receivable, Net Amount   93
Derivatives 209 132
Financial Liabilities:    
Derivatives 187 86
LowerOfCostOrMarket [Member] | Carrying Amount    
Financial Assets:    
Loans held for sale (includes $613 and $413 respectively, measured at fair value)(1) $ 191 $ 75