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Securities - Gross unrealized losses and related fair values (Detail)
$ in Millions
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
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 175 148
Securities available-for-sale gross unrealized losses one year or less $ (208) $ (95)
Securities available-for-sale aggregate fair value of investment one year or less $ 7,616 $ 7,240
Number of Securities available for sale greater than one year | security 155 154
Securities available-for-sale gross unrealized losses greater than one year $ (595) $ (449)
Securities available-for-sale aggregate fair value of investment greater than one year $ 13,142 $ 14,239
Number of securities held-to-maturity in one year or less | security 515 381
Securities held-to-maturity gross unrealized losses one year or less $ (159) $ (53)
Securities held-to-maturity aggregate fair value of investment one year or less $ 7,947 $ 7,099
Number of securities held-to-maturity greater than one year | security 784 792
Securities held-to-maturity gross unrealized losses greater than one year $ (164) $ (96)
Securities held-to-maturity aggregate fair value of investment greater than one year $ 4,244 $ 3,982
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 8 3
Securities available-for-sale gross unrealized losses one year or less $ (13) $ (3)
Securities available-for-sale aggregate fair value of investment one year or less $ 834 $ 463
Number of Securities available for sale greater than one year | security 42 48
Securities available-for-sale gross unrealized losses greater than one year $ (394) $ (326)
Securities available-for-sale aggregate fair value of investment greater than one year $ 9,375 $ 10,285
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 102 83
Securities available-for-sale gross unrealized losses one year or less $ (33) $ (7)
Securities available-for-sale aggregate fair value of investment one year or less $ 1,161 $ 883
Number of Securities available for sale greater than one year | security 84 77
Securities available-for-sale gross unrealized losses greater than one year $ (165) $ (94)
Securities available-for-sale aggregate fair value of investment greater than one year $ 3,005 $ 3,109
Number of securities held-to-maturity in one year or less | security 352 264
Securities held-to-maturity gross unrealized losses one year or less $ (31) $ (5)
Securities held-to-maturity aggregate fair value of investment one year or less $ 1,860 $ 1,126
Number of securities held-to-maturity greater than one year | security 288 284
Securities held-to-maturity gross unrealized losses greater than one year $ (37) $ (25)
Securities held-to-maturity aggregate fair value of investment greater than one year $ 963 $ 1,020
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 55 52
Securities available-for-sale gross unrealized losses one year or less $ (162) $ (85)
Securities available-for-sale aggregate fair value of investment one year or less $ 4,994 $ 5,161
Number of Securities available for sale greater than one year | security 24 23
Securities available-for-sale gross unrealized losses greater than one year $ (33) $ (20)
Securities available-for-sale aggregate fair value of investment greater than one year $ 666 $ 573
Number of securities held-to-maturity in one year or less | security 162 116
Securities held-to-maturity gross unrealized losses one year or less $ (128) $ (48)
Securities held-to-maturity aggregate fair value of investment one year or less $ 6,087 $ 5,973
Number of securities held-to-maturity greater than one year | security 495 506
Securities held-to-maturity gross unrealized losses greater than one year $ (127) $ (71)
Securities held-to-maturity aggregate fair value of investment greater than one year $ 3,281 $ 2,962
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 1 2
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 1 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 4
Securities available-for-sale gross unrealized losses greater than one year $ (3) $ (3)
Securities available-for-sale aggregate fair value of investment greater than one year $ 49 $ 51
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 9 10
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 $ 627 $ 733
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 $ 0
Securities available-for-sale aggregate fair value of investment greater than one year $ 47 $ 44
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
Securities available-for-sale gross unrealized losses one year or less   $ 0
Securities available-for-sale aggregate fair value of investment one year or less   $ 0
Number of Securities available for sale greater than one year | security   1
Securities available-for-sale gross unrealized losses greater than one year   $ (6)
Securities available-for-sale aggregate fair value of investment greater than one year   $ 177