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
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Credit-related OTTI losses $ 0 $ 33  
Other than temporary impairment losses recorded on debt securities 2 14  
Cumulative credit losses on debt securities held 284 284 $ 248
Debt securities      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less than Twelve Months, Fair Value 124,937 124,937 181,821
Less than Twelve Months, Gross Unrealized Losses (908) (908) (3,072)
Twelve Months or Longer, Fair Value 41,689 41,689 8,856
Twelve Months or Longer, Gross Unrealized Losses (1,234) (1,234) (228)
Total, Fair Value 166,626 166,626 190,677
Total, Gross Unrealized Losses (2,142) (2,142) (3,300)
Temporarily impaired AFS debt securities | Debt securities      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less than Twelve Months, Fair Value 124,910 124,910 181,727
Less than Twelve Months, Gross Unrealized Losses (907) (907) (3,071)
Twelve Months or Longer, Fair Value 41,659 41,659 8,455
Twelve Months or Longer, Gross Unrealized Losses (1,229) (1,229) (212)
Total, Fair Value 166,569 166,569 190,182
Total, Gross Unrealized Losses (2,136) (2,136) (3,283)
Temporarily impaired AFS debt securities | Agency      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less than Twelve Months, Fair Value 96,106 96,106 135,210
Less than Twelve Months, Gross Unrealized Losses (681) (681) (1,846)
Twelve Months or Longer, Fair Value 17,570 17,570 3,770
Twelve Months or Longer, Gross Unrealized Losses (505) (505) (117)
Total, Fair Value 113,676 113,676 138,980
Total, Gross Unrealized Losses (1,186) (1,186) (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 2,137 2,137 3,229
Less than Twelve Months, Gross Unrealized Losses (15) (15) (25)
Twelve Months or Longer, Fair Value 1,051 1,051 1,028
Twelve Months or Longer, Gross Unrealized Losses (30) (30) (26)
Total, Fair Value 3,188 3,188 4,257
Total, Gross Unrealized Losses (45) (45) (51)
Temporarily impaired AFS debt securities | Commercial      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less than Twelve Months, Fair Value 5,068 5,068 9,018
Less than Twelve Months, Gross Unrealized Losses (59) (59) (293)
Twelve Months or Longer, Fair Value 2,819 2,819 0
Twelve Months or Longer, Gross Unrealized Losses (109) (109) 0
Total, Fair Value 7,887 7,887 9,018
Total, Gross Unrealized Losses (168) (168) (293)
Temporarily impaired AFS debt securities | Non-agency residential      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less than Twelve Months, Fair Value 140 140 212
Less than Twelve Months, Gross Unrealized Losses (7) (7) (1)
Twelve Months or Longer, Fair Value 118 118 204
Twelve Months or Longer, Gross Unrealized Losses (8) (8) (13)
Total, Fair Value 258 258 416
Total, Gross Unrealized Losses (15) (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 103,451 103,451 147,669
Less than Twelve Months, Gross Unrealized Losses (762) (762) (2,165)
Twelve Months or Longer, Fair Value 21,558 21,558 5,002
Twelve Months or Longer, Gross Unrealized Losses (652) (652) (156)
Total, Fair Value 125,009 125,009 152,671
Total, Gross Unrealized Losses (1,414) (1,414) (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 20,685 20,685 28,462
Less than Twelve Months, Gross Unrealized Losses (144) (144) (752)
Twelve Months or Longer, Fair Value 17,035 17,035 0
Twelve Months or Longer, Gross Unrealized Losses (482) (482) 0
Total, Fair Value 37,720 37,720 28,462
Total, Gross Unrealized Losses (626) (626) (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 774 774 52
Less than Twelve Months, Gross Unrealized Losses (1) (1) (1)
Twelve Months or Longer, Fair Value 0 0 142
Twelve Months or Longer, Gross Unrealized Losses 0 0 (2)
Total, Fair Value 774 774 194
Total, Gross Unrealized Losses (1) (1) (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 0 0 762
Less than Twelve Months, Gross Unrealized Losses 0 0 (5)
Twelve Months or Longer, Fair Value 384 384 1,438
Twelve Months or Longer, Gross Unrealized Losses (3) (3) (18)
Total, Fair Value 384 384 2,200
Total, Gross Unrealized Losses (3) (3) (23)
Temporarily impaired AFS debt securities | Total taxable securities      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Less than Twelve Months, Fair Value 124,910 124,910 176,945
Less than Twelve Months, Gross Unrealized Losses (907) (907) (2,923)
Twelve Months or Longer, Fair Value 38,977 38,977 6,582
Twelve Months or Longer, Gross Unrealized Losses (1,137) (1,137) (176)
Total, Fair Value 163,887 163,887 183,527
Total, Gross Unrealized Losses (2,044) (2,044) (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 0 0 4,782
Less than Twelve Months, Gross Unrealized Losses 0 0 (148)
Twelve Months or Longer, Fair Value 2,682 2,682 1,873
Twelve Months or Longer, Gross Unrealized Losses (92) (92) (36)
Total, Fair Value 2,682 2,682 6,655
Total, Gross Unrealized Losses (92) (92) (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 27 27 94
Less than Twelve Months, Gross Unrealized Losses (1) (1) (1)
Twelve Months or Longer, Fair Value 30 30 401
Twelve Months or Longer, Gross Unrealized Losses (5) (5) (16)
Total, Fair Value 57 57 495
Total, Gross Unrealized Losses $ (6) $ (6) $ (17)