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Accumulated Other Comprehensive Income (Loss) - Change in Accumulated OCI (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance $ 243,476 $ 232,475 $ 236,962
Net change (110) 3,665 (4,984)
Cumulative adjustment for accounting change related to debit valuation adjustments   0  
Ending Balance 256,176 243,476 232,475
Debit Valuation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Net change 615    
Cumulative adjustment for accounting change related to debit valuation adjustments   (1,226)  
Ending Balance (611)    
Derivatives      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (1,661) (2,277) (2,869)
Net change 584 616 592
Ending Balance (1,077) (1,661) (2,277)
Employee Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (3,350) (2,407) (4,456)
Net change 394 (943) 2,049
Ending Balance (2,956) (3,350) (2,407)
Foreign currency      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (669) (512) (377)
Net change (123) (157) (135)
Ending Balance (792) (669) (512)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance (4,022) (7,687) (2,703)
Net change (110) 3,665 (4,984)
Cumulative adjustment for accounting change related to debit valuation adjustments   (1,226)  
Ending Balance (5,358) (4,022) (7,687)
Debt securities | Available-for-sale debt securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 1,641 (2,487) 4,537
Net change (1,625) 4,128 (7,024)
Ending Balance 16 1,641 (2,487)
Equity securities | Available-for-sale debt securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning Balance 17 (4) 462
Net change 45 21 (466)
Ending Balance $ 62 $ 17 $ (4)