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, 2018
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Credit-related OTTI losses $ 4 $ 27    
Other than temporary impairment losses recorded on debt securities 0 0 $ 0  
Cumulative credit losses on debt securities held 278 $ 279    
Debt securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 150,507     $ 111,645
Less than Twelve Months, Gross Unrealized Losses (3,641)     (693)
Twelve Months or Longer, Fair Value 104,252     110,109
Twelve Months or Longer, Gross Unrealized Losses (4,347)     (2,425)
Total, Fair Value 254,759     221,754
Total, Gross Unrealized Losses (7,988)     (3,118)
Temporarily impaired AFS debt securities | Debt securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 150,404     111,587
Less than Twelve Months, Gross Unrealized Losses (3,639)     (692)
Twelve Months or Longer, Fair Value 104,252     110,109
Twelve Months or Longer, Gross Unrealized Losses (4,347)     (2,425)
Total, Fair Value 254,656     221,696
Total, Gross Unrealized Losses (7,986)     (3,117)
Temporarily impaired AFS debt securities | Mortgage-backed securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 122,205     82,188
Less than Twelve Months, Gross Unrealized Losses (2,875)     (438)
Twelve Months or Longer, Fair Value 74,691     78,882
Twelve Months or Longer, Gross Unrealized Losses (3,198)     (1,554)
Total, Fair Value 196,896     161,070
Total, Gross Unrealized Losses (6,073)     (1,992)
Temporarily impaired AFS debt securities | Agency        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 109,535     73,535
Less than Twelve Months, Gross Unrealized Losses (2,608)     (352)
Twelve Months or Longer, Fair Value 68,632     72,612
Twelve Months or Longer, Gross Unrealized Losses (2,875)     (1,344)
Total, Fair Value 178,167     146,147
Total, Gross Unrealized Losses (5,483)     (1,696)
Temporarily impaired AFS debt securities | Agency-collateralized mortgage obligations        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 3,635     2,743
Less than Twelve Months, Gross Unrealized Losses (77)     (29)
Twelve Months or Longer, Fair Value 1,579     1,684
Twelve Months or Longer, Gross Unrealized Losses (65)     (52)
Total, Fair Value 5,214     4,427
Total, Gross Unrealized Losses (142)     (81)
Temporarily impaired AFS debt securities | Commercial        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 8,794     5,575
Less than Twelve Months, Gross Unrealized Losses (182)     (50)
Twelve Months or Longer, Fair Value 4,480     4,586
Twelve Months or Longer, Gross Unrealized Losses (258)     (158)
Total, Fair Value 13,274     10,161
Total, Gross Unrealized Losses (440)     (208)
Temporarily impaired AFS debt securities | Non-agency residential        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 241     335
Less than Twelve Months, Gross Unrealized Losses (8)     (7)
Twelve Months or Longer, Fair Value 0     0
Twelve Months or Longer, Gross Unrealized Losses 0     0
Total, Fair Value 241     335
Total, Gross Unrealized Losses (8)     (7)
Temporarily impaired AFS debt securities | U.S. Treasury and agency securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 27,813     27,537
Less than Twelve Months, Gross Unrealized Losses (760)     (251)
Twelve Months or Longer, Fair Value 23,792     24,035
Twelve Months or Longer, Gross Unrealized Losses (1,034)     (767)
Total, Fair Value 51,605     51,572
Total, Gross Unrealized Losses (1,794)     (1,018)
Temporarily impaired AFS debt securities | Non-U.S. securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value       772
Less than Twelve Months, Gross Unrealized Losses       (1)
Twelve Months or Longer, Fair Value       0
Twelve Months or Longer, Gross Unrealized Losses       0
Total, Fair Value       772
Total, Gross Unrealized Losses       (1)
Temporarily impaired AFS debt securities | Other taxable securities, substantially all asset-backed securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 135     0
Less than Twelve Months, Gross Unrealized Losses (3)     0
Twelve Months or Longer, Fair Value 102     92
Twelve Months or Longer, Gross Unrealized Losses (2)     (2)
Total, Fair Value 237     92
Total, Gross Unrealized Losses (5)     (2)
Temporarily impaired AFS debt securities | Total taxable securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 150,153     110,497
Less than Twelve Months, Gross Unrealized Losses (3,638)     (690)
Twelve Months or Longer, Fair Value 98,585     103,009
Twelve Months or Longer, Gross Unrealized Losses (4,234)     (2,323)
Total, Fair Value 248,738     213,506
Total, Gross Unrealized Losses (7,872)     (3,013)
Temporarily impaired AFS debt securities | Tax-exempt securities        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 251     1,090
Less than Twelve Months, Gross Unrealized Losses (1)     (2)
Twelve Months or Longer, Fair Value 5,667     7,100
Twelve Months or Longer, Gross Unrealized Losses (113)     (102)
Total, Fair Value 5,918     8,190
Total, Gross Unrealized Losses (114)     (104)
Other-than-temporarily impaired AFS debt securities | Non-agency residential        
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]        
Less than Twelve Months, Fair Value 103     58
Less than Twelve Months, Gross Unrealized Losses (2)     (1)
Twelve Months or Longer, Fair Value 0     0
Twelve Months or Longer, Gross Unrealized Losses 0     0
Total, Fair Value 103     58
Total, Gross Unrealized Losses $ (2)     $ (1)