Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value      
Less than Twelve Months $ 17,831 $ 111,645  
Twelve Months or Longer 169,434 110,109  
Total 187,265 221,754  
Gross Unrealized Losses      
Less than Twelve Months (74) (693)  
Twelve Months or Longer (5,339) (2,425)  
Total (5,413) (3,118)  
Credit-related OTTI losses 33 41 $ 19
Other than temporary impairment losses recorded on debt securities 0 0  
Cumulative credit losses on debt securities held 120 274 $ 253
Temporarily impaired AFS debt securities      
Fair Value      
Less than Twelve Months 17,700 111,587  
Twelve Months or Longer 169,431 110,109  
Total 187,131 221,696  
Gross Unrealized Losses      
Less than Twelve Months (74) (692)  
Twelve Months or Longer (5,339) (2,425)  
Total (5,413) (3,117)  
Temporarily impaired AFS debt securities | Mortgage-backed securities      
Fair Value      
Less than Twelve Months 16,224 82,188  
Twelve Months or Longer 115,703 78,882  
Total 131,927 161,070  
Gross Unrealized Losses      
Less than Twelve Months (65) (438)  
Twelve Months or Longer (3,886) (1,554)  
Total (3,951) (1,992)  
Temporarily impaired AFS debt securities | Agency      
Fair Value      
Less than Twelve Months 14,771 73,535  
Twelve Months or Longer 99,211 72,612  
Total 113,982 146,147  
Gross Unrealized Losses      
Less than Twelve Months (49) (352)  
Twelve Months or Longer (3,379) (1,344)  
Total (3,428) (1,696)  
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations      
Fair Value      
Less than Twelve Months 3 2,743  
Twelve Months or Longer 4,452 1,684  
Total 4,455 4,427  
Gross Unrealized Losses      
Less than Twelve Months 0 (29)  
Twelve Months or Longer (110) (52)  
Total (110) (81)  
Temporarily impaired AFS debt securities | Commercial      
Fair Value      
Less than Twelve Months 1,344 5,575  
Twelve Months or Longer 11,991 4,586  
Total 13,335 10,161  
Gross Unrealized Losses      
Less than Twelve Months (8) (50)  
Twelve Months or Longer (394) (158)  
Total (402) (208)  
Temporarily impaired AFS debt securities | Non-agency residential      
Fair Value      
Less than Twelve Months 106 335  
Twelve Months or Longer 49 0  
Total 155 335  
Gross Unrealized Losses      
Less than Twelve Months (8) (7)  
Twelve Months or Longer (3) 0  
Total (11) (7)  
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities      
Fair Value      
Less than Twelve Months 288 27,537  
Twelve Months or Longer 51,374 24,035  
Total 51,662 51,572  
Gross Unrealized Losses      
Less than Twelve Months (1) (251)  
Twelve Months or Longer (1,377) (767)  
Total (1,378) (1,018)  
Temporarily impaired AFS debt securities | Non-U.S. securities      
Fair Value      
Less than Twelve Months 773 772  
Twelve Months or Longer 21 0  
Total 794 772  
Gross Unrealized Losses      
Less than Twelve Months (5) (1)  
Twelve Months or Longer (1) 0  
Total (6) (1)  
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities      
Fair Value      
Less than Twelve Months 183 0  
Twelve Months or Longer 185 92  
Total 368 92  
Gross Unrealized Losses      
Less than Twelve Months (1) 0  
Twelve Months or Longer (5) (2)  
Total (6) (2)  
Temporarily impaired AFS debt securities | Total taxable securities      
Fair Value      
Less than Twelve Months 17,468 110,497  
Twelve Months or Longer 167,283 103,009  
Total 184,751 213,506  
Gross Unrealized Losses      
Less than Twelve Months (72) (690)  
Twelve Months or Longer (5,269) (2,323)  
Total (5,341) (3,013)  
Temporarily impaired AFS debt securities | Tax-exempt securities      
Fair Value      
Less than Twelve Months 232 1,090  
Twelve Months or Longer 2,148 7,100  
Total 2,380 8,190  
Gross Unrealized Losses      
Less than Twelve Months (2) (2)  
Twelve Months or Longer (70) (102)  
Total (72) (104)  
Other-than-temporarily impaired AFS debt securities | Non-agency residential      
Fair Value      
Less than Twelve Months 131 58  
Twelve Months or Longer 3 0  
Total 134 58  
Gross Unrealized Losses      
Less than Twelve Months 0 (1)  
Twelve Months or Longer 0 0  
Total $ 0 $ (1)