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
Dec. 31, 2019
Dec. 31, 2018
Fair Value    
Less than Twelve Months $ 39,109 $ 17,831
Twelve Months or Longer 38,742 169,434
Total 77,851 187,265
Gross Unrealized Losses    
Less than Twelve Months (146) (74)
Twelve Months or Longer (298) (5,339)
Total (444) (5,413)
Temporarily impaired AFS debt securities    
Fair Value    
Less than Twelve Months 39,006 17,700
Twelve Months or Longer 38,721 169,431
Total 77,727 187,131
Gross Unrealized Losses    
Less than Twelve Months (141) (74)
Twelve Months or Longer (295) (5,339)
Total (436) (5,413)
Temporarily impaired AFS debt securities | Mortgage-backed securities    
Fair Value    
Less than Twelve Months 20,095 16,224
Twelve Months or Longer 18,606 115,703
Total 38,701 131,927
Gross Unrealized Losses    
Less than Twelve Months (65) (65)
Twelve Months or Longer (168) (3,886)
Total (233) (3,951)
Temporarily impaired AFS debt securities | Agency    
Fair Value    
Less than Twelve Months 17,641 14,771
Twelve Months or Longer 17,238 99,211
Total 34,879 113,982
Gross Unrealized Losses    
Less than Twelve Months (41) (49)
Twelve Months or Longer (142) (3,379)
Total (183) (3,428)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations    
Fair Value    
Less than Twelve Months 255 3
Twelve Months or Longer 925 4,452
Total 1,180 4,455
Gross Unrealized Losses    
Less than Twelve Months (1) 0
Twelve Months or Longer (23) (110)
Total (24) (110)
Temporarily impaired AFS debt securities | Commercial    
Fair Value    
Less than Twelve Months 2,180 1,344
Twelve Months or Longer 442 11,991
Total 2,622 13,335
Gross Unrealized Losses    
Less than Twelve Months (22) (8)
Twelve Months or Longer (3) (394)
Total (25) (402)
Temporarily impaired AFS debt securities | Non-agency residential    
Fair Value    
Less than Twelve Months 19 106
Twelve Months or Longer 1 49
Total 20 155
Gross Unrealized Losses    
Less than Twelve Months (1) (8)
Twelve Months or Longer 0 (3)
Total (1) (11)
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities    
Fair Value    
Less than Twelve Months 12,836 288
Twelve Months or Longer 18,866 51,374
Total 31,702 51,662
Gross Unrealized Losses    
Less than Twelve Months (71) (1)
Twelve Months or Longer (124) (1,377)
Total (195) (1,378)
Temporarily impaired AFS debt securities | Non-U.S. securities    
Fair Value    
Less than Twelve Months 851 773
Twelve Months or Longer 837 21
Total 1,688 794
Gross Unrealized Losses    
Less than Twelve Months 0 (5)
Twelve Months or Longer (2) (1)
Total (2) (6)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities    
Fair Value    
Less than Twelve Months 938 183
Twelve Months or Longer 222 185
Total 1,160 368
Gross Unrealized Losses    
Less than Twelve Months 0 (1)
Twelve Months or Longer 0 (5)
Total 0 (6)
Temporarily impaired AFS debt securities | Total taxable securities    
Fair Value    
Less than Twelve Months 34,720 17,468
Twelve Months or Longer 38,531 167,283
Total 73,251 184,751
Gross Unrealized Losses    
Less than Twelve Months (136) (72)
Twelve Months or Longer (294) (5,269)
Total (430) (5,341)
Temporarily impaired AFS debt securities | Tax-exempt securities    
Fair Value    
Less than Twelve Months 4,286 232
Twelve Months or Longer 190 2,148
Total 4,476 2,380
Gross Unrealized Losses    
Less than Twelve Months (5) (2)
Twelve Months or Longer (1) (70)
Total (6) (72)
Other-than-temporarily impaired AFS debt securities | Non-agency residential    
Fair Value    
Less than Twelve Months 103 131
Twelve Months or Longer 21 3
Total 124 134
Gross Unrealized Losses    
Less than Twelve Months (5) 0
Twelve Months or Longer (3) 0
Total $ (8) $ 0