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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair Value          
Less than Twelve Months $ 64,470   $ 64,470    
Twelve Months or Longer 143,463   143,463    
Total 207,933   207,933    
Gross Unrealized Losses          
Less than Twelve Months (1,799)   (1,799)    
Twelve Months or Longer (7,218)   (7,218)    
Total (9,017)   (9,017)    
Credit-related OTTI losses 12 $ 0 23 $ 33  
Other than temporary impairment losses recorded on debt securities 0 0 0 0  
Cumulative credit losses on debt securities held 135 $ 284 135 $ 284  
Debt securities          
Fair Value          
Less than Twelve Months         $ 111,645
Twelve Months or Longer         110,109
Total         221,754
Gross Unrealized Losses          
Less than Twelve Months         (693)
Twelve Months or Longer         (2,425)
Total         (3,118)
Temporarily impaired AFS debt securities          
Fair Value          
Less than Twelve Months 64,377   64,377    
Twelve Months or Longer 143,463   143,463    
Total 207,840   207,840    
Gross Unrealized Losses          
Less than Twelve Months (1,799)   (1,799)    
Twelve Months or Longer (7,218)   (7,218)    
Total (9,017)   (9,017)    
Temporarily impaired AFS debt securities | Debt securities          
Fair Value          
Less than Twelve Months         111,587
Twelve Months or Longer         110,109
Total         221,696
Gross Unrealized Losses          
Less than Twelve Months         (692)
Twelve Months or Longer         (2,425)
Total         (3,117)
Temporarily impaired AFS debt securities | Mortgage-backed securities          
Fair Value          
Less than Twelve Months 52,338   52,338   82,188
Twelve Months or Longer 98,571   98,571   78,882
Total 150,909   150,909   161,070
Gross Unrealized Losses          
Less than Twelve Months (1,385)   (1,385)   (438)
Twelve Months or Longer (5,170)   (5,170)   (1,554)
Total (6,555)   (6,555)   (1,992)
Temporarily impaired AFS debt securities | Agency          
Fair Value          
Less than Twelve Months 45,433   45,433   73,535
Twelve Months or Longer 87,214   87,214   72,612
Total 132,647   132,647   146,147
Gross Unrealized Losses          
Less than Twelve Months (1,190)   (1,190)   (352)
Twelve Months or Longer (4,520)   (4,520)   (1,344)
Total (5,710)   (5,710)   (1,696)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations          
Fair Value          
Less than Twelve Months 1,959   1,959   2,743
Twelve Months or Longer 3,344   3,344   1,684
Total 5,303   5,303   4,427
Gross Unrealized Losses          
Less than Twelve Months (47)   (47)   (29)
Twelve Months or Longer (162)   (162)   (52)
Total (209)   (209)   (81)
Temporarily impaired AFS debt securities | Commercial          
Fair Value          
Less than Twelve Months 4,923   4,923   5,575
Twelve Months or Longer 7,962   7,962   4,586
Total 12,885   12,885   10,161
Gross Unrealized Losses          
Less than Twelve Months (146)   (146)   (50)
Twelve Months or Longer (484)   (484)   (158)
Total (630)   (630)   (208)
Temporarily impaired AFS debt securities | Non-agency residential          
Fair Value          
Less than Twelve Months 23   23   335
Twelve Months or Longer 51   51   0
Total 74   74   335
Gross Unrealized Losses          
Less than Twelve Months (2)   (2)   (7)
Twelve Months or Longer (4)   (4)   0
Total (6)   (6)   (7)
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities          
Fair Value          
Less than Twelve Months 10,651   10,651   27,537
Twelve Months or Longer 40,337   40,337   24,035
Total 50,988   50,988   51,572
Gross Unrealized Losses          
Less than Twelve Months (409)   (409)   (251)
Twelve Months or Longer (1,957)   (1,957)   (767)
Total (2,366)   (2,366)   (1,018)
Temporarily impaired AFS debt securities | Non-U.S. securities          
Fair Value          
Less than Twelve Months 706   706   772
Twelve Months or Longer 81   81   0
Total 787   787   772
Gross Unrealized Losses          
Less than Twelve Months (1)   (1)   (1)
Twelve Months or Longer (1)   (1)   0
Total (2)   (2)   (1)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities          
Fair Value          
Less than Twelve Months 208   208   0
Twelve Months or Longer 150   150   92
Total 358   358   92
Gross Unrealized Losses          
Less than Twelve Months (3)   (3)   0
Twelve Months or Longer (4)   (4)   (2)
Total (7)   (7)   (2)
Temporarily impaired AFS debt securities | Total taxable securities          
Fair Value          
Less than Twelve Months 63,903   63,903   110,497
Twelve Months or Longer 139,139   139,139   103,009
Total 203,042   203,042   213,506
Gross Unrealized Losses          
Less than Twelve Months (1,798)   (1,798)   (690)
Twelve Months or Longer (7,132)   (7,132)   (2,323)
Total (8,930)   (8,930)   (3,013)
Temporarily impaired AFS debt securities | Tax-exempt securities          
Fair Value          
Less than Twelve Months 474   474   1,090
Twelve Months or Longer 4,324   4,324   7,100
Total 4,798   4,798   8,190
Gross Unrealized Losses          
Less than Twelve Months (1)   (1)   (2)
Twelve Months or Longer (86)   (86)   (102)
Total (87)   (87)   (104)
Other-than-temporarily impaired AFS debt securities | Non-agency residential          
Fair Value          
Less than Twelve Months 93   93   58
Twelve Months or Longer 0   0   0
Total 93   93   58
Gross Unrealized Losses          
Less than Twelve Months 0   0   (1)
Twelve Months or Longer 0   0   0
Total $ 0   $ 0   $ (1)