Annual report pursuant to Section 13 and 15(d)

Securities - Temporarily Impaired and Other-than-temporarily Impaired AFS Debt Securities (Details)

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Securities - Temporarily Impaired and Other-than-temporarily Impaired AFS Debt Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value $ 181,821 $ 134,167
Less than Twelve Months, Gross Unrealized Losses (3,072) (1,274)
Twelve Months or Longer, Fair Value 8,856 18,186
Twelve Months or Longer, Gross Unrealized Losses (228) (516)
Total, Fair Value 190,677 152,353
Total, Gross Unrealized Losses (3,300) (1,790)
Temporarily impaired AFS debt securities | Debt securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 181,727 133,686
Less than Twelve Months, Gross Unrealized Losses (3,071) (1,255)
Twelve Months or Longer, Fair Value 8,455 18,088
Twelve Months or Longer, Gross Unrealized Losses (212) (502)
Total, Fair Value 190,182 151,774
Total, Gross Unrealized Losses (3,283) (1,757)
Temporarily impaired AFS debt securities | Agency    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 135,210 115,502
Less than Twelve Months, Gross Unrealized Losses (1,846) (1,082)
Twelve Months or Longer, Fair Value 3,770 13,083
Twelve Months or Longer, Gross Unrealized Losses (117) (388)
Total, Fair Value 138,980 128,585
Total, Gross Unrealized Losses (1,963) (1,470)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 3,229 2,536
Less than Twelve Months, Gross Unrealized Losses (25) (19)
Twelve Months or Longer, Fair Value 1,028 1,212
Twelve Months or Longer, Gross Unrealized Losses (26) (36)
Total, Fair Value 4,257 3,748
Total, Gross Unrealized Losses (51) (55)
Temporarily impaired AFS debt securities | Commercial    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 9,018 4,587
Less than Twelve Months, Gross Unrealized Losses (293) (65)
Twelve Months or Longer, Fair Value 0 0
Twelve Months or Longer, Gross Unrealized Losses 0 0
Total, Fair Value 9,018 4,587
Total, Gross Unrealized Losses (293) (65)
Temporarily impaired AFS debt securities | Non-agency residential    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 212 553
Less than Twelve Months, Gross Unrealized Losses (1) (5)
Twelve Months or Longer, Fair Value 204 723
Twelve Months or Longer, Gross Unrealized Losses (13) (33)
Total, Fair Value 416 1,276
Total, Gross Unrealized Losses (14) (38)
Temporarily impaired AFS debt securities | Mortgage-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 147,669 123,178
Less than Twelve Months, Gross Unrealized Losses (2,165) (1,171)
Twelve Months or Longer, Fair Value 5,002 15,018
Twelve Months or Longer, Gross Unrealized Losses (156) (457)
Total, Fair Value 152,671 138,196
Total, Gross Unrealized Losses (2,321) (1,628)
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 28,462 1,172
Less than Twelve Months, Gross Unrealized Losses (752) (5)
Twelve Months or Longer, Fair Value 0 190
Twelve Months or Longer, Gross Unrealized Losses 0 (4)
Total, Fair Value 28,462 1,362
Total, Gross Unrealized Losses (752) (9)
Temporarily impaired AFS debt securities | Non-U.S. securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 52 0
Less than Twelve Months, Gross Unrealized Losses (1) 0
Twelve Months or Longer, Fair Value 142 134
Twelve Months or Longer, Gross Unrealized Losses (2) (3)
Total, Fair Value 194 134
Total, Gross Unrealized Losses (3) (3)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 762 4,936
Less than Twelve Months, Gross Unrealized Losses (5) (67)
Twelve Months or Longer, Fair Value 1,438 869
Twelve Months or Longer, Gross Unrealized Losses (18) (17)
Total, Fair Value 2,200 5,805
Total, Gross Unrealized Losses (23) (84)
Temporarily impaired AFS debt securities | Total taxable securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 176,945 129,286
Less than Twelve Months, Gross Unrealized Losses (2,923) (1,243)
Twelve Months or Longer, Fair Value 6,582 16,211
Twelve Months or Longer, Gross Unrealized Losses (176) (481)
Total, Fair Value 183,527 145,497
Total, Gross Unrealized Losses (3,099) (1,724)
Temporarily impaired AFS debt securities | Tax-exempt securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 4,782 4,400
Less than Twelve Months, Gross Unrealized Losses (148) (12)
Twelve Months or Longer, Fair Value 1,873 1,877
Twelve Months or Longer, Gross Unrealized Losses (36) (21)
Total, Fair Value 6,655 6,277
Total, Gross Unrealized Losses (184) (33)
Other-than-temporarily impaired AFS debt securities | Non-agency residential    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 94 481
Less than Twelve Months, Gross Unrealized Losses (1) (19)
Twelve Months or Longer, Fair Value 401 98
Twelve Months or Longer, Gross Unrealized Losses (16) (14)
Total, Fair Value 495 579
Total, Gross Unrealized Losses $ (17) $ (33)