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, 2017
Dec. 31, 2016
Financial Assets:    
Trading account securities $ 86 $ 133
Loans held for sale 488 513
Available-for-sale and other securities 15,469 15,563
Held-to-maturity securities 9,091 7,807
Loans and Leases Receivable, Net Amount 69,426 66,324
Derivatives 132 238
Financial Liabilities:    
Deposits 77,041 75,608
Short-term borrowings 5,056 3,693
Long-term borrowings 9,206 8,309
Derivatives 86 99
Carrying Amount    
Financial Assets:    
Cash and short term assets 1,567 1,443
Trading account securities 86 133
Loans held for sale 488 513
Available-for-sale and other securities 15,469 15,563
Held-to-maturity securities 9,091 7,807
Loans and Leases Receivable, Net Amount 69,426 66,324
Derivatives 132 238
Financial Liabilities:    
Deposits 77,041 75,608
Short-term borrowings 5,056 3,693
Long-term borrowings 9,206 8,309
Derivatives 86 98
Fair Value    
Financial Assets:    
Cash and short term assets 1,567 1,443
Trading account securities 86 133
Loans held for sale 491 516
Available-for-sale and other securities 15,469 15,563
Held-to-maturity securities 8,971 7,787
Loans and Leases Receivable, Net Amount 69,146 66,295
Derivatives 132 238
Financial Liabilities:    
Deposits 77,010 76,161
Short-term borrowings 5,056 3,693
Long-term borrowings 9,402 8,387
Derivatives 86 98
Level 1 | Fair Value    
Financial Assets:    
Held-to-maturity securities 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:    
Held-to-maturity securities 8,971 7,787
Loans and Leases Receivable, Net Amount 0 0
Financial Liabilities:    
Deposits 73,975 72,319
Short-term borrowings 0 0
Long-term borrowings 8,944 7,980
Level 3 | Fair Value    
Financial Assets:    
Held-to-maturity securities 0 0
Loans and Leases Receivable, Net Amount 69,146 66,295
Financial Liabilities:    
Deposits 3,035 3,842
Short-term borrowings 5,056 $ 3,692
Long-term borrowings $ 458