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Stock Compensation Plans - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Taxes related to net settlement of vested equity awards $ 60 $ 39
Restricted stock awards and restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares granted 9 14
Weighted average price per share (in dollars per share) $ 15.31 $ 12.54
Unrecognized compensation expense $ 273  
Restricted stock awards and restricted stock units | First Anniversary    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 20.00%  
Restricted stock awards and restricted stock units | Second Anniversary    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 40.00%  
Restricted stock awards and restricted stock units | Third Anniversary    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 40.00%  
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 73