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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair Value          
Less than Twelve Months $ 3,773   $ 3,773   $ 17,831
Twelve Months or Longer 101,772   101,772   169,434
Total 105,545   105,545   187,265
Gross Unrealized Losses          
Less than Twelve Months (15)   (15)   (74)
Twelve Months or Longer (1,117)   (1,117)   (5,339)
Total (1,132)   (1,132)   (5,413)
Credit-related OTTI losses 9 $ 8 11 $ 11  
Other than temporary impairment losses recorded on debt securities     0 $ 0  
Cumulative credit losses on debt securities held 123   123   264
Temporarily impaired AFS debt securities          
Fair Value          
Less than Twelve Months 3,597   3,597   17,700
Twelve Months or Longer 101,752   101,752   169,431
Total 105,349   105,349   187,131
Gross Unrealized Losses          
Less than Twelve Months (10)   (10)   (74)
Twelve Months or Longer (1,114)   (1,114)   (5,339)
Total (1,124)   (1,124)   (5,413)
Temporarily impaired AFS debt securities | Mortgage-backed securities          
Fair Value          
Less than Twelve Months 1,059   1,059   16,224
Twelve Months or Longer 78,859   78,859   115,703
Total 79,918   79,918   131,927
Gross Unrealized Losses          
Less than Twelve Months (5)   (5)   (65)
Twelve Months or Longer (838)   (838)   (3,886)
Total (843)   (843)   (3,951)
Temporarily impaired AFS debt securities | Agency          
Fair Value          
Less than Twelve Months 106   106   14,771
Twelve Months or Longer 75,567   75,567   99,211
Total 75,673   75,673   113,982
Gross Unrealized Losses          
Less than Twelve Months 0   0   (49)
Twelve Months or Longer (799)   (799)   (3,379)
Total (799)   (799)   (3,428)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations          
Fair Value          
Less than Twelve Months 59   59   3
Twelve Months or Longer 1,652   1,652   4,452
Total 1,711   1,711   4,455
Gross Unrealized Losses          
Less than Twelve Months 0   0   0
Twelve Months or Longer (27)   (27)   (110)
Total (27)   (27)   (110)
Temporarily impaired AFS debt securities | Commercial          
Fair Value          
Less than Twelve Months 859   859   1,344
Twelve Months or Longer 1,639   1,639   11,991
Total 2,498   2,498   13,335
Gross Unrealized Losses          
Less than Twelve Months (4)   (4)   (8)
Twelve Months or Longer (12)   (12)   (394)
Total (16)   (16)   (402)
Temporarily impaired AFS debt securities | Non-agency residential          
Fair Value          
Less than Twelve Months 35   35   106
Twelve Months or Longer 1   1   49
Total 36   36   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 821   821   288
Twelve Months or Longer 22,323   22,323   51,374
Total 23,144   23,144   51,662
Gross Unrealized Losses          
Less than Twelve Months (4)   (4)   (1)
Twelve Months or Longer (242)   (242)   (1,377)
Total (246)   (246)   (1,378)
Temporarily impaired AFS debt securities | Non-U.S. securities          
Fair Value          
Less than Twelve Months 1,335   1,335   773
Twelve Months or Longer 0   0   21
Total 1,335   1,335   794
Gross Unrealized Losses          
Less than Twelve Months (1)   (1)   (5)
Twelve Months or Longer 0   0   (1)
Total (1)   (1)   (6)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities          
Fair Value          
Less than Twelve Months 332   332   183
Twelve Months or Longer 3   3   185
Total 335   335   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 3,547   3,547   17,468
Twelve Months or Longer 101,185   101,185   167,283
Total 104,732   104,732   184,751
Gross Unrealized Losses          
Less than Twelve Months (10)   (10)   (72)
Twelve Months or Longer (1,080)   (1,080)   (5,269)
Total (1,090)   (1,090)   (5,341)
Temporarily impaired AFS debt securities | Tax-exempt securities          
Fair Value          
Less than Twelve Months 50   50   232
Twelve Months or Longer 567   567   2,148
Total 617   617   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 176   176   131
Twelve Months or Longer 20   20   3
Total 196   196   134
Gross Unrealized Losses          
Less than Twelve Months (5)   (5)   0
Twelve Months or Longer (3)   (3)   0
Total $ (8)   $ (8)   $ 0