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
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance $ 266,840 $ 256,176
Net change (28) 2,529
Ending Balance 268,153 263,004
Debit Valuation Adjustments    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (767) (611)
Net change 9 127
Ending Balance (758) (484)
Derivatives    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (895) (1,077)
Net change 38 24
Ending Balance (857) (1,053)
Employee Benefit Plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (3,480) (2,956)
Net change 27 10
Ending Balance (3,453) (2,946)
Foreign currency    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (879) (792)
Net change (3) 12
Ending Balance (882) (780)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (7,288) (5,358)
Net change (28) 2,529
Ending Balance (7,316) (2,829)
Debt securities | Available-for-sale debt securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance (1,299) 16
Net change (103) 2,389
Ending Balance (1,402) 2,405
Equity securities | Available-for-sale debt securities    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning Balance 32 62
Net change 4 (33)
Ending Balance $ 36 $ 29