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Securities - Gross unrealized losses and related fair values (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities available for sale in one year or less | security 148 421
Securities available-for-sale gross unrealized losses one year or less $ (95) $ (604)
Securities available-for-sale aggregate fair value of investment one year or less $ 7,240 $ 24,619
Number of Securities available for sale greater than one year | security 154 66
Securities available-for-sale gross unrealized losses greater than one year $ (449) $ (217)
Securities available-for-sale aggregate fair value of investment greater than one year $ 14,239 $ 4,931
Number of securities held-to-maturity in one year or less | security 381 614
Securities held-to-maturity gross unrealized losses one year or less $ (53) $ (86)
Securities held-to-maturity aggregate fair value of investment one year or less $ 7,099 $ 6,747
Number of securities held-to-maturity greater than one year | security 792 551
Securities held-to-maturity gross unrealized losses greater than one year $ (96) $ (1)
Securities held-to-maturity aggregate fair value of investment greater than one year $ 3,982 $ 133
U.S. Treasury [Member]    
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities available for sale in one year or less | security 3 40
Securities available-for-sale gross unrealized losses one year or less $ (3) $ (378)
Securities available-for-sale aggregate fair value of investment one year or less $ 463 $ 13,707
Number of Securities available for sale greater than one year | security 48 32
Securities available-for-sale gross unrealized losses greater than one year $ (326) $ (181)
Securities available-for-sale aggregate fair value of investment greater than one year $ 10,285 $ 3,908
US Government sponsored enterprises [Member]    
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities available for sale in one year or less | security 83 316
Securities available-for-sale gross unrealized losses one year or less $ (7) $ (155)
Securities available-for-sale aggregate fair value of investment one year or less $ 883 $ 6,474
Number of Securities available for sale greater than one year | security 77 18
Securities available-for-sale gross unrealized losses greater than one year $ (94) $ (13)
Securities available-for-sale aggregate fair value of investment greater than one year $ 3,109 $ 427
Number of securities held-to-maturity in one year or less | security 264 434
Securities held-to-maturity gross unrealized losses one year or less $ (5) $ (21)
Securities held-to-maturity aggregate fair value of investment one year or less $ 1,126 $ 2,013
Number of securities held-to-maturity greater than one year | security 284 45
Securities held-to-maturity gross unrealized losses greater than one year $ (25) $ 0
Securities held-to-maturity aggregate fair value of investment greater than one year $ 1,020 $ 21
US Government agency issued or guaranteed [Member]    
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities available for sale in one year or less | security 52 57
Securities available-for-sale gross unrealized losses one year or less $ (85) $ (66)
Securities available-for-sale aggregate fair value of investment one year or less $ 5,161 $ 3,941
Number of Securities available for sale greater than one year | security 23 7
Securities available-for-sale gross unrealized losses greater than one year $ (20) $ (11)
Securities available-for-sale aggregate fair value of investment greater than one year $ 573 $ 252
Number of securities held-to-maturity in one year or less | security 116 179
Securities held-to-maturity gross unrealized losses one year or less $ (48) $ (65)
Securities held-to-maturity aggregate fair value of investment one year or less $ 5,973 $ 4,734
Number of securities held-to-maturity greater than one year | security 506 503
Securities held-to-maturity gross unrealized losses greater than one year $ (71) $ (1)
Securities held-to-maturity aggregate fair value of investment greater than one year $ 2,962 $ 112
Obligations of U.S. states and political subdivision [Member]    
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities held-to-maturity in one year or less | security 1 1
Securities held-to-maturity gross unrealized losses one year or less $ 0 $ 0
Securities held-to-maturity aggregate fair value of investment one year or less $ 0 $ 0
Number of securities held-to-maturity greater than one year | security 2 3
Securities held-to-maturity gross unrealized losses greater than one year $ 0 $ 0
Securities held-to-maturity aggregate fair value of investment greater than one year $ 0 $ 0
Asset backed securities [Member]    
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities available for sale in one year or less | security 0 0
Securities available-for-sale gross unrealized losses one year or less $ 0 $ 0
Securities available-for-sale aggregate fair value of investment one year or less $ 0 $ 0
Number of Securities available for sale greater than one year | security 4 8
Securities available-for-sale gross unrealized losses greater than one year $ (3) $ (11)
Securities available-for-sale aggregate fair value of investment greater than one year $ 51 $ 166
Foreign debt securities [Member]    
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities available for sale in one year or less | security 10 7
Securities available-for-sale gross unrealized losses one year or less $ 0 $ 0
Securities available-for-sale aggregate fair value of investment one year or less $ 733 $ 343
Number of Securities available for sale greater than one year | security 1 1
Securities available-for-sale gross unrealized losses greater than one year $ 0 $ (1)
Securities available-for-sale aggregate fair value of investment greater than one year $ 44 $ 178
Equity securities [Member]    
Schedule of Available-for-sale and Held-to-Maturity Securities [Line Items]    
Number of securities available for sale in one year or less | security 0 1
Securities available-for-sale gross unrealized losses one year or less $ 0 $ (5)
Securities available-for-sale aggregate fair value of investment one year or less $ 0 $ 154
Number of Securities available for sale greater than one year | security 1 0
Securities available-for-sale gross unrealized losses greater than one year $ (6) $ 0
Securities available-for-sale aggregate fair value of investment greater than one year $ 177 $ 0