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Stock Incentive Plans (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Stock Incentive Plans Narratives [Abstract]        
Compensation Expense $ 650 $ 446 $ 245  
Unrecognized Compensation Expense for Nonvested Equity Awards       $ 323
Weighted-average period for total unrecognized compensation expense for nonvested equity awards 2 years 5 months      
Fair value of stock incentive awards vested $ 325 $ 228 $ 221  
Stock Incentive Awards Units Outstanding (Roll Forward)        
Units Outstanding, Beginning of Period 44.0      
Granted 21.2      
Settled (8.4)      
Forfeited or expired (1.7)      
Units Outstanding, End of Period 55.1 44.0    
Stock Incentive Awards Weighted Average Grant Date Fair Value (Per Share) [Roll Forward]        
Weighted Average Grant Date Fair Value, Outstanding, Beginning of Period $ 16.48      
Weighted Average Grant Date Fair Value, Granted 31.80      
Weighted Average Grant Date Fair Value, Settled 33.18      
Weighted Average Grant Date Fair Value, Forfeited or Expired 22.45      
Weighted Average Grant Date Fair Value, Outstanding, End of Period $ 16.48 $ 16.48   $ 19.77
Remaining Contractual Term [Abstract]        
Weighted Average Remaining Contractual Terms in years, Outstanding 2 years 6 months 3 years    
Restricted Stock Units (RSUs) [Member]        
Stock Incentive Plans Narratives [Abstract]        
Service period 3 years      
Performance Share Units (PSUs) [Member]        
Stock Incentive Plans Narratives [Abstract]        
Performance period 3 years      
Stock options [Member]        
Stock Incentive Plans Narratives [Abstract]        
Service period 19 months      
Performance period 3 years      
Expiration period 10 years      
Vesting feature portion of award exercisable       40.00%
Restricted Stock Awards (RSAs) [Member]        
Stock Incentive Plans Narratives [Abstract]        
Service period 3 years