Quarterly report pursuant to Section 13 or 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
Mar. 31, 2017
Dec. 31, 2016
Debt securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value $ 189,138 $ 181,821
Less than Twelve Months, Gross Unrealized Losses (3,129) (3,072)
Twelve Months or Longer, Fair Value 9,076 8,856
Twelve Months or Longer, Gross Unrealized Losses (271) (228)
Total, Fair Value 198,214 190,677
Total, Gross Unrealized Losses (3,400) (3,300)
Temporarily impaired AFS debt securities | Debt securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 189,138 181,727
Less than Twelve Months, Gross Unrealized Losses (3,129) (3,071)
Twelve Months or Longer, Fair Value 8,951 8,455
Twelve Months or Longer, Gross Unrealized Losses (262) (212)
Total, Fair Value 198,089 190,182
Total, Gross Unrealized Losses (3,391) (3,283)
Temporarily impaired AFS debt securities | Agency    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 142,657 135,210
Less than Twelve Months, Gross Unrealized Losses (2,076) (1,846)
Twelve Months or Longer, Fair Value 3,603 3,770
Twelve Months or Longer, Gross Unrealized Losses (118) (117)
Total, Fair Value 146,260 138,980
Total, Gross Unrealized Losses (2,194) (1,963)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 2,580 3,229
Less than Twelve Months, Gross Unrealized Losses (24) (25)
Twelve Months or Longer, Fair Value 964 1,028
Twelve Months or Longer, Gross Unrealized Losses (25) (26)
Total, Fair Value 3,544 4,257
Total, Gross Unrealized Losses (49) (51)
Temporarily impaired AFS debt securities | Commercial    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 8,460 9,018
Less than Twelve Months, Gross Unrealized Losses (264) (293)
Twelve Months or Longer, Fair Value 0 0
Twelve Months or Longer, Gross Unrealized Losses 0 0
Total, Fair Value 8,460 9,018
Total, Gross Unrealized Losses (264) (293)
Temporarily impaired AFS debt securities | Non-agency residential    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 201 212
Less than Twelve Months, Gross Unrealized Losses (3) (1)
Twelve Months or Longer, Fair Value 162 204
Twelve Months or Longer, Gross Unrealized Losses (12) (13)
Total, Fair Value 363 416
Total, Gross Unrealized Losses (15) (14)
Temporarily impaired AFS debt securities | Mortgage-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 153,898 147,669
Less than Twelve Months, Gross Unrealized Losses (2,367) (2,165)
Twelve Months or Longer, Fair Value 4,729 5,002
Twelve Months or Longer, Gross Unrealized Losses (155) (156)
Total, Fair Value 158,627 152,671
Total, Gross Unrealized Losses (2,522) (2,321)
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 31,304 28,462
Less than Twelve Months, Gross Unrealized Losses (666) (752)
Twelve Months or Longer, Fair Value 0 0
Twelve Months or Longer, Gross Unrealized Losses 0 0
Total, Fair Value 31,304 28,462
Total, Gross Unrealized Losses (666) (752)
Temporarily impaired AFS debt securities | Non-U.S. securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 96 52
Less than Twelve Months, Gross Unrealized Losses (3) (1)
Twelve Months or Longer, Fair Value 5 142
Twelve Months or Longer, Gross Unrealized Losses (1) (2)
Total, Fair Value 101 194
Total, Gross Unrealized Losses (4) (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 273 762
Less than Twelve Months, Gross Unrealized Losses (2) (5)
Twelve Months or Longer, Fair Value 1,352 1,438
Twelve Months or Longer, Gross Unrealized Losses (9) (18)
Total, Fair Value 1,625 2,200
Total, Gross Unrealized Losses (11) (23)
Temporarily impaired AFS debt securities | Total taxable securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 185,571 176,945
Less than Twelve Months, Gross Unrealized Losses (3,038) (2,923)
Twelve Months or Longer, Fair Value 6,086 6,582
Twelve Months or Longer, Gross Unrealized Losses (165) (176)
Total, Fair Value 191,657 183,527
Total, Gross Unrealized Losses (3,203) (3,099)
Temporarily impaired AFS debt securities | Tax-exempt securities    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Less than Twelve Months, Fair Value 3,567 4,782
Less than Twelve Months, Gross Unrealized Losses (91) (148)
Twelve Months or Longer, Fair Value 2,865 1,873
Twelve Months or Longer, Gross Unrealized Losses (97) (36)
Total, Fair Value 6,432 6,655
Total, Gross Unrealized Losses (188) (184)
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 0 94
Less than Twelve Months, Gross Unrealized Losses 0 (1)
Twelve Months or Longer, Fair Value 125 401
Twelve Months or Longer, Gross Unrealized Losses (9) (16)
Total, Fair Value 125 495
Total, Gross Unrealized Losses $ (9) $ (17)