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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value          
Less than Twelve Months $ 14,566   $ 14,566   $ 17,831
Twelve Months or Longer 49,470   49,470   169,434
Total 64,036   64,036   187,265
Gross Unrealized Losses          
Less than Twelve Months (38)   (38)   (74)
Twelve Months or Longer (466)   (466)   (5,339)
Total (504)   (504)   (5,413)
Credit-related OTTI losses 12 $ 12 23 $ 23  
Cumulative credit losses on debt securities held 135 $ 135 135 $ 135  
Temporarily impaired AFS debt securities          
Fair Value          
Less than Twelve Months 14,448   14,448   17,700
Twelve Months or Longer 49,442   49,442   169,431
Total 63,890   63,890   187,131
Gross Unrealized Losses          
Less than Twelve Months (34)   (34)   (74)
Twelve Months or Longer (462)   (462)   (5,339)
Total (496)   (496)   (5,413)
Temporarily impaired AFS debt securities | Mortgage-backed securities          
Fair Value          
Less than Twelve Months 8,434   8,434   16,224
Twelve Months or Longer 29,355   29,355   115,703
Total 37,789   37,789   131,927
Gross Unrealized Losses          
Less than Twelve Months (14)   (14)   (65)
Twelve Months or Longer (283)   (283)   (3,886)
Total (297)   (297)   (3,951)
Temporarily impaired AFS debt securities | Agency          
Fair Value          
Less than Twelve Months 7,409   7,409   14,771
Twelve Months or Longer 28,226   28,226   99,211
Total 35,635   35,635   113,982
Gross Unrealized Losses          
Less than Twelve Months (10)   (10)   (49)
Twelve Months or Longer (264)   (264)   (3,379)
Total (274)   (274)   (3,428)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations          
Fair Value          
Less than Twelve Months 64   64   3
Twelve Months or Longer 1,014   1,014   4,452
Total 1,078   1,078   4,455
Gross Unrealized Losses          
Less than Twelve Months 0   0   0
Twelve Months or Longer (18)   (18)   (110)
Total (18)   (18)   (110)
Temporarily impaired AFS debt securities | Commercial          
Fair Value          
Less than Twelve Months 928   928   1,344
Twelve Months or Longer 114   114   11,991
Total 1,042   1,042   13,335
Gross Unrealized Losses          
Less than Twelve Months (3)   (3)   (8)
Twelve Months or Longer (1)   (1)   (394)
Total (4)   (4)   (402)
Temporarily impaired AFS debt securities | Non-agency residential          
Fair Value          
Less than Twelve Months 33   33   106
Twelve Months or Longer 1   1   49
Total 34   34   155
Gross Unrealized Losses          
Less than Twelve Months (1)   (1)   (8)
Twelve Months or Longer 0   0   (3)
Total (1)   (1)   (11)
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities          
Fair Value          
Less than Twelve Months 4,193   4,193   288
Twelve Months or Longer 18,628   18,628   51,374
Total 22,821   22,821   51,662
Gross Unrealized Losses          
Less than Twelve Months (18)   (18)   (1)
Twelve Months or Longer (145)   (145)   (1,377)
Total (163)   (163)   (1,378)
Temporarily impaired AFS debt securities | Non-U.S. securities          
Fair Value          
Less than Twelve Months 1,234   1,234   773
Twelve Months or Longer 140   140   21
Total 1,374   1,374   794
Gross Unrealized Losses          
Less than Twelve Months (2)   (2)   (5)
Twelve Months or Longer 0   0   (1)
Total (2)   (2)   (6)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities          
Fair Value          
Less than Twelve Months 354   354   183
Twelve Months or Longer 280   280   185
Total 634   634   368
Gross Unrealized Losses          
Less than Twelve Months 0   0   (1)
Twelve Months or Longer 0   0   (5)
Total 0   0   (6)
Temporarily impaired AFS debt securities | Total taxable securities          
Fair Value          
Less than Twelve Months 14,215   14,215   17,468
Twelve Months or Longer 48,403   48,403   167,283
Total 62,618   62,618   184,751
Gross Unrealized Losses          
Less than Twelve Months (34)   (34)   (72)
Twelve Months or Longer (428)   (428)   (5,269)
Total (462)   (462)   (5,341)
Temporarily impaired AFS debt securities | Tax-exempt securities          
Fair Value          
Less than Twelve Months 233   233   232
Twelve Months or Longer 1,039   1,039   2,148
Total 1,272   1,272   2,380
Gross Unrealized Losses          
Less than Twelve Months 0   0   (2)
Twelve Months or Longer (34)   (34)   (70)
Total (34)   (34)   (72)
Other-than-temporarily impaired AFS debt securities | Non-agency residential          
Fair Value          
Less than Twelve Months 118   118   131
Twelve Months or Longer 28   28   3
Total 146   146   134
Gross Unrealized Losses          
Less than Twelve Months (4)   (4)   0
Twelve Months or Longer (4)   (4)   0
Total $ (8)   $ (8)   $ 0