Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details)

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Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     $ 266,840 $ 256,176
Net change $ 711 $ 860 683 3,389
Ending Balance 270,987 267,426 270,987 267,426
Debit Valuation Adjustments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (767) (611)
Net change     (69) 114
Ending Balance (836) (497) (836) (497)
Derivatives        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (895) (1,077)
Net change     132 150
Ending Balance (763) (927) (763) (927)
Employee Benefit Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (3,480) (2,956)
Net change     54 23
Ending Balance (3,426) (2,933) (3,426) (2,933)
Foreign currency        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (879) (792)
Net change     97 (9)
Ending Balance (782) (801) (782) (801)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (7,288) (5,358)
Net change     683 3,389
Ending Balance (6,605) (1,969) (6,605) (1,969)
Debt securities | Available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (1,299) 16
Net change     457 3,164
Ending Balance (842) 3,180 (842) 3,180
Equity securities | Available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     32 62
Net change     12 (53)
Ending Balance $ 44 $ 9 $ 44 $ 9