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Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS      
Trading account assets $ 867,000,000 $ 788,000,000  
Securities available for sale 20,212,000,000 14,218,000,000  
Held-to-maturity securities, Carrying Amount 10,232,000,000 4,897,000,000  
Held-to-maturity securities 10,007,000,000 4,848,000,000  
Other investments 738,000,000 655,000,000  
Loans, net of allowance, Carrying Amount 85,180,000,000 59,080,000,000  
Loans, net of allowance 3,000,000 4,000,000  
Loans held for sale, Carrying Amount 1,104,000,000 [1] 639,000,000 [1] $ 734,000,000
Loans held for sale 0 0  
Derivative assets 803,000,000 619,000,000  
LIABILITIES      
Long-term debt, Carrying Amount 12,384,000,000 10,184,000,000  
Derivative liabilities 636,000,000 632,000,000  
Carrying Amount [Member]      
ASSETS      
Cash and short-term investments 3,452,000,000 3,314,000,000  
Trading account assets 867,000,000 788,000,000  
Securities available for sale 20,212,000,000 14,218,000,000  
Held-to-maturity securities, Carrying Amount 10,232,000,000 4,897,000,000  
Other investments 738,000,000 655,000,000  
Loans, net of allowance, Carrying Amount 85,180,000,000 59,080,000,000  
Loans held for sale, Carrying Amount 1,104,000,000 639,000,000  
Derivative assets 803,000,000 619,000,000  
LIABILITIES      
Deposits with no stated maturity 93,906,000,000 65,527,000,000  
Time deposits, Carrying Amount 10,181,000,000 5,519,000,000  
Short-term borrowings, Carrying Amount 2,310,000,000 905,000,000  
Long-term debt, Carrying Amount 12,384,000,000 10,184,000,000  
Derivative liabilities 636,000,000 632,000,000  
Fair Value [Member]      
ASSETS      
Cash and short-term investments 3,452,000,000 3,314,000,000  
Trading account assets 867,000,000 788,000,000  
Securities available for sale 20,212,000,000 14,218,000,000  
Held-to-maturity securities 10,007,000,000 4,848,000,000  
Other investments 733,000,000 655,000,000  
Loans, net of allowance 83,285,000,000 57,508,000,000  
Loans held for sale 1,104,000,000 639,000,000  
Derivative assets 803,000,000 619,000,000  
Derivative assets, Netting Adjustment (431,000,000) (866,000,000)  
LIABILITIES      
Deposits with no stated maturity 93,906,000,000 65,527,000,000  
Time deposits 10,267,000,000 5,575,000,000  
Short-term borrowings 2,310,000,000 905,000,000  
Long-term debt 12,690,000,000 10,407,000,000  
Derivative liabilities 636,000,000 632,000,000  
Derivative liabilities, netting adjustment (384,000,000) (494,000,000)  
Fair Value [Member] | Level 1 [Member]      
ASSETS      
Cash and short-term investments 3,452,000,000 3,314,000,000  
Trading account assets 0 3,000,000  
Securities available for sale 3,000,000 3,000,000  
Held-to-maturity securities 0 0  
Other investments 0 0  
Loans, net of allowance 0 0  
Loans held for sale 0 0  
Derivative assets 114,000,000 143,000,000  
LIABILITIES      
Deposits with no stated maturity 0 0  
Time deposits 0 0  
Short-term borrowings 192,000,000 0  
Long-term debt 12,386,000,000 9,987,000,000  
Derivative liabilities 102,000,000 116,000,000  
Fair Value [Member] | Level 2 [Member]      
ASSETS      
Cash and short-term investments 0 0  
Trading account assets 867,000,000 785,000,000  
Securities available for sale 20,192,000,000 14,198,000,000  
Held-to-maturity securities 10,007,000,000 4,848,000,000  
Other investments 0 19,000,000  
Loans, net of allowance 0 0  
Loans held for sale 62,000,000 0  
Derivative assets 1,110,000,000 1,324,000,000  
LIABILITIES      
Deposits with no stated maturity 93,906,000,000 65,527,000,000  
Time deposits 10,267,000,000 5,575,000,000  
Short-term borrowings 2,118,000,000 905,000,000  
Long-term debt 304,000,000 420,000,000  
Derivative liabilities 918,000,000 1,009,000,000  
Fair Value [Member] | Level 3 [Member]      
ASSETS      
Cash and short-term investments 0 0  
Trading account assets 0 0  
Securities available for sale 17,000,000 17,000,000  
Held-to-maturity securities 0 0  
Other investments 569,000,000 393,000,000  
Loans, net of allowance 83,285,000,000 57,508,000,000  
Loans held for sale 1,042,000,000 639,000,000  
Derivative assets 10,000,000 18,000,000  
LIABILITIES      
Deposits with no stated maturity 0 0  
Time deposits 0 0  
Short-term borrowings 0 0  
Long-term debt 0 0  
Derivative liabilities 0 1,000,000  
Other Investments [Member] | Fair Value [Member]      
ASSETS      
Other investments $ 164,000,000 $ 243,000,000  
[1] Total loans held for sale include Real estate — residential mortgage loans held for sale at fair value of $62 million at December 31, 2016.See notes to Consolidated Financial Statements