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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     $ 266,840 $ 256,176
Net change $ 437 $ 268 1,120 3,657
Ending Balance 272,459 270,083 272,459 270,083
Debit Valuation Adjustments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (767) (611)
Net change     (149) 49
Ending Balance (916) (562) (916) (562)
Derivatives        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (895) (1,077)
Net change     156 277
Ending Balance (739) (800) (739) (800)
Employee Benefit Plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (3,480) (2,956)
Net change     80 29
Ending Balance (3,400) (2,927) (3,400) (2,927)
Foreign currency        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (879) (792)
Net change     102 (17)
Ending Balance (777) (809) (777) (809)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (7,288) (5,358)
Net change     1,120 3,657
Ending Balance (6,168) (1,701) (6,168) (1,701)
Debt securities | Available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     (1,299) 16
Net change     945 3,362
Ending Balance (354) 3,378 (354) 3,378
Equity securities | Available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     32 62
Net change     (14) (43)
Ending Balance $ 18 $ 19 $ 18 $ 19