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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value          
Less than Twelve Months $ 133,190   $ 133,190    
Twelve Months or Longer 93,633   93,633    
Total 226,823   226,823    
Gross Unrealized Losses          
Less than Twelve Months (3,996)   (3,996)    
Twelve Months or Longer (4,317)   (4,317)    
Total (8,313)   (8,313)    
Credit-related OTTI losses 8 $ 6 11 $ 33  
Other than temporary impairment losses recorded on debt securities 0 0 0 0  
Cumulative credit losses on debt securities held 264 $ 284 264 $ 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 133,040   133,040    
Twelve Months or Longer 93,633   93,633    
Total 226,673   226,673    
Gross Unrealized Losses          
Less than Twelve Months (3,991)   (3,991)    
Twelve Months or Longer (4,317)   (4,317)    
Total (8,308)   (8,308)    
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 105,308   105,308   82,188
Twelve Months or Longer 65,588   65,588   78,882
Total 170,896   170,896   161,070
Gross Unrealized Losses          
Less than Twelve Months (3,067)   (3,067)   (438)
Twelve Months or Longer (3,095)   (3,095)   (1,554)
Total (6,162)   (6,162)   (1,992)
Temporarily impaired AFS debt securities | Agency          
Fair Value          
Less than Twelve Months 93,123   93,123   73,535
Twelve Months or Longer 59,404   59,404   72,612
Total 152,527   152,527   146,147
Gross Unrealized Losses          
Less than Twelve Months (2,718)   (2,718)   (352)
Twelve Months or Longer (2,708)   (2,708)   (1,344)
Total (5,426)   (5,426)   (1,696)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations          
Fair Value          
Less than Twelve Months 3,706   3,706   2,743
Twelve Months or Longer 1,698   1,698   1,684
Total 5,404   5,404   4,427
Gross Unrealized Losses          
Less than Twelve Months (93)   (93)   (29)
Twelve Months or Longer (79)   (79)   (52)
Total (172)   (172)   (81)
Temporarily impaired AFS debt securities | Commercial          
Fair Value          
Less than Twelve Months 8,325   8,325   5,575
Twelve Months or Longer 4,486   4,486   4,586
Total 12,811   12,811   10,161
Gross Unrealized Losses          
Less than Twelve Months (250)   (250)   (50)
Twelve Months or Longer (308)   (308)   (158)
Total (558)   (558)   (208)
Temporarily impaired AFS debt securities | Non-agency residential          
Fair Value          
Less than Twelve Months 154   154   335
Twelve Months or Longer 0   0   0
Total 154   154   335
Gross Unrealized Losses          
Less than Twelve Months (6)   (6)   (7)
Twelve Months or Longer 0   0   0
Total (6)   (6)   (7)
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities          
Fair Value          
Less than Twelve Months 27,277   27,277   27,537
Twelve Months or Longer 23,856   23,856   24,035
Total 51,133   51,133   51,572
Gross Unrealized Losses          
Less than Twelve Months (918)   (918)   (251)
Twelve Months or Longer (1,118)   (1,118)   (767)
Total (2,036)   (2,036)   (1,018)
Temporarily impaired AFS debt securities | Non-U.S. securities          
Fair Value          
Less than Twelve Months 0   0   772
Twelve Months or Longer 86   86   0
Total 86   86   772
Gross Unrealized Losses          
Less than Twelve Months 0   0   (1)
Twelve Months or Longer (1)   (1)   0
Total (1)   (1)   (1)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities          
Fair Value          
Less than Twelve Months 152   152   0
Twelve Months or Longer 113   113   92
Total 265   265   92
Gross Unrealized Losses          
Less than Twelve Months (4)   (4)   0
Twelve Months or Longer (3)   (3)   (2)
Total (7)   (7)   (2)
Temporarily impaired AFS debt securities | Total taxable securities          
Fair Value          
Less than Twelve Months 132,737   132,737   110,497
Twelve Months or Longer 89,643   89,643   103,009
Total 222,380   222,380   213,506
Gross Unrealized Losses          
Less than Twelve Months (3,989)   (3,989)   (690)
Twelve Months or Longer (4,217)   (4,217)   (2,323)
Total (8,206)   (8,206)   (3,013)
Temporarily impaired AFS debt securities | Tax-exempt securities          
Fair Value          
Less than Twelve Months 303   303   1,090
Twelve Months or Longer 3,990   3,990   7,100
Total 4,293   4,293   8,190
Gross Unrealized Losses          
Less than Twelve Months (2)   (2)   (2)
Twelve Months or Longer (100)   (100)   (102)
Total (102)   (102)   (104)
Other-than-temporarily impaired AFS debt securities | Non-agency residential          
Fair Value          
Less than Twelve Months 150   150   58
Twelve Months or Longer 0   0   0
Total 150   150   58
Gross Unrealized Losses          
Less than Twelve Months (5)   (5)   (1)
Twelve Months or Longer 0   0   0
Total $ (5)   $ (5)   $ (1)