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
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair Value      
Less than Twelve Months $ 5,012   $ 17,831
Twelve Months or Longer 156,166   169,434
Total 161,178   187,265
Gross Unrealized Losses      
Less than Twelve Months (17)   (74)
Twelve Months or Longer (2,920)   (5,339)
Total (2,937)   (5,413)
Credit-related OTTI losses (2) $ (4)  
Other than temporary impairment losses recorded on debt securities 0 0  
Cumulative credit losses on debt securities held 122 $ 278  
Temporarily impaired AFS debt securities      
Fair Value      
Less than Twelve Months 4,959   17,700
Twelve Months or Longer 156,083   169,431
Total 161,042   187,131
Gross Unrealized Losses      
Less than Twelve Months (16)   (74)
Twelve Months or Longer (2,921)   (5,339)
Total (2,937)   (5,413)
Temporarily impaired AFS debt securities | Mortgage-backed securities      
Fair Value      
Less than Twelve Months 1,971   16,224
Twelve Months or Longer 111,045   115,703
Total 113,016   131,927
Gross Unrealized Losses      
Less than Twelve Months (14)   (65)
Twelve Months or Longer (2,180)   (3,886)
Total (2,194)   (3,951)
Temporarily impaired AFS debt securities | Agency      
Fair Value      
Less than Twelve Months 820   14,771
Twelve Months or Longer 98,153   99,211
Total 98,973   113,982
Gross Unrealized Losses      
Less than Twelve Months (2)   (49)
Twelve Months or Longer (1,949)   (3,379)
Total (1,951)   (3,428)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations      
Fair Value      
Less than Twelve Months 61   3
Twelve Months or Longer 3,495   4,452
Total 3,556   4,455
Gross Unrealized Losses      
Less than Twelve Months 0   0
Twelve Months or Longer (67)   (110)
Total (67)   (110)
Temporarily impaired AFS debt securities | Commercial      
Fair Value      
Less than Twelve Months 1,004   1,344
Twelve Months or Longer 9,396   11,991
Total 10,400   13,335
Gross Unrealized Losses      
Less than Twelve Months (4)   (8)
Twelve Months or Longer (164)   (394)
Total (168)   (402)
Temporarily impaired AFS debt securities | Non-agency residential      
Fair Value      
Less than Twelve Months 86   106
Twelve Months or Longer 1   49
Total 87   155
Gross Unrealized Losses      
Less than Twelve Months (8)   (8)
Twelve Months or Longer 0   (3)
Total (8)   (11)
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities      
Fair Value      
Less than Twelve Months 250   288
Twelve Months or Longer 43,444   51,374
Total 43,694   51,662
Gross Unrealized Losses      
Less than Twelve Months (1)   (1)
Twelve Months or Longer (697)   (1,377)
Total (698)   (1,378)
Temporarily impaired AFS debt securities | Non-U.S. securities      
Fair Value      
Less than Twelve Months 2,350   773
Twelve Months or Longer 59   21
Total 2,409   794
Gross Unrealized Losses      
Less than Twelve Months (1)   (5)
Twelve Months or Longer (1)   (1)
Total (2)   (6)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities      
Fair Value      
Less than Twelve Months 265   183
Twelve Months or Longer 65   185
Total 330   368
Gross Unrealized Losses      
Less than Twelve Months 0   (1)
Twelve Months or Longer (1)   (5)
Total (1)   (6)
Temporarily impaired AFS debt securities | Total taxable securities      
Fair Value      
Less than Twelve Months 4,836   17,468
Twelve Months or Longer 154,613   167,283
Total 159,449   184,751
Gross Unrealized Losses      
Less than Twelve Months (16)   (72)
Twelve Months or Longer (2,879)   (5,269)
Total (2,895)   (5,341)
Temporarily impaired AFS debt securities | Tax-exempt securities      
Fair Value      
Less than Twelve Months 123   232
Twelve Months or Longer 1,470   2,148
Total 1,593   2,380
Gross Unrealized Losses      
Less than Twelve Months 0   (2)
Twelve Months or Longer (42)   (70)
Total (42)   (72)
Other-than-temporarily impaired AFS debt securities | Non-agency residential      
Fair Value      
Less than Twelve Months 53   131
Twelve Months or Longer 83   3
Total 136   134
Gross Unrealized Losses      
Less than Twelve Months (1)   0
Twelve Months or Longer 1   0
Total $ 0   $ 0