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Securities - Gross unrealized losses and related fair values (Detail)
$ in Millions
Sep. 30, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
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 35 287
Securities available-for-sale gross unrealized losses one year or less $ (33) $ (403)
Securities available-for-sale aggregate fair value of investment one year or less $ 5,298 $ 22,754
Number of Securities available for sale greater than one year | security 64 38
Securities available-for-sale gross unrealized losses greater than one year $ (255) $ (93)
Securities available-for-sale aggregate fair value of investment greater than one year $ 4,823 $ 1,516
Number of securities held-to-maturity in one year or less | security 128 458
Securities held-to-maturity gross unrealized losses one year or less $ (2) $ (36)
Securities held-to-maturity aggregate fair value of investment one year or less $ 1,271 $ 4,446
Number of securities held-to-maturity greater than one year | security 561 709
Securities held-to-maturity gross unrealized losses greater than one year $ (1) $ 0
Securities held-to-maturity aggregate fair value of investment greater than one year $ 92 $ 21
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 15 52
Securities available-for-sale gross unrealized losses one year or less $ (28) $ (227)
Securities available-for-sale aggregate fair value of investment one year or less $ 3,110 $ 11,046
Number of Securities available for sale greater than one year | security 28 5
Securities available-for-sale gross unrealized losses greater than one year $ (192) $ (43)
Securities available-for-sale aggregate fair value of investment greater than one year $ 3,573 $ 924
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 13 164
Securities available-for-sale gross unrealized losses one year or less $ (4) $ (30)
Securities available-for-sale aggregate fair value of investment one year or less $ 1,683 $ 1,451
Number of Securities available for sale greater than one year | security 22 19
Securities available-for-sale gross unrealized losses greater than one year $ (24) $ (13)
Securities available-for-sale aggregate fair value of investment greater than one year $ 818 $ 282
Number of securities held-to-maturity in one year or less | security 14 312
Securities held-to-maturity gross unrealized losses one year or less $ 0 $ (14)
Securities held-to-maturity aggregate fair value of investment one year or less $ 20 $ 1,143
Number of securities held-to-maturity greater than one year | security 46 49
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 $ 21 $ 0
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 4 62
Securities available-for-sale gross unrealized losses one year or less $ 0 $ (141)
Securities available-for-sale aggregate fair value of investment one year or less $ 316 $ 9,725
Number of Securities available for sale greater than one year | security 5 3
Securities available-for-sale gross unrealized losses greater than one year $ (6) $ (8)
Securities available-for-sale aggregate fair value of investment greater than one year $ 91 $ 101
Number of securities held-to-maturity in one year or less | security 114 145
Securities held-to-maturity gross unrealized losses one year or less $ (2) $ (22)
Securities held-to-maturity aggregate fair value of investment one year or less $ 1,251 $ 3,303
Number of securities held-to-maturity greater than one year | security 512 657
Securities held-to-maturity gross unrealized losses greater than one year $ (1) $ 0
Securities held-to-maturity aggregate fair value of investment greater than one year $ 71 $ 20
Obligations of U.S. states and political subdivision [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   4
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   $ 16
Number of Securities available for sale greater than one year | security   3
Securities available-for-sale gross unrealized losses greater than one year   $ 0
Securities available-for-sale aggregate fair value of investment greater than one year   $ 45
Number of securities held-to-maturity in one year or less | security 0 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 3 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 $ 1
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 1
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 $ 4 $ 9
Number of Securities available for sale greater than one year | security 8 8
Securities available-for-sale gross unrealized losses greater than one year $ (32) $ (29)
Securities available-for-sale aggregate fair value of investment greater than one year $ 159 $ 164
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 1 3
Securities available-for-sale gross unrealized losses one year or less $ 0 $ (2)
Securities available-for-sale aggregate fair value of investment one year or less $ 27 $ 351
Number of Securities available for sale greater than one year | security 1 0
Securities available-for-sale gross unrealized losses greater than one year $ (1) $ 0
Securities available-for-sale aggregate fair value of investment greater than one year $ 182 $ 0
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 1 1
Securities available-for-sale gross unrealized losses one year or less $ (1) $ (3)
Securities available-for-sale aggregate fair value of investment one year or less $ 158 $ 156
Number of Securities available for sale greater than one year | security 0 0
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 $ 0 $ 0