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Stockholders' Equity - Narrative (Details)
$ / shares in Units, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2015
$ / shares
Dec. 31, 2015
USD ($)
vote
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
vote
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Oct. 31, 2015
USD ($)
May. 31, 2015
USD ($)
Class of Stock [Line Items]                  
Share of common stock outstanding, vote on proposals | vote   1       1      
Dividends declared per common share (in dollars per share) | $ / shares $ 0.28 $ 0.28   $ 0.24 $ 0.24 $ 0.80 $ 0.72    
Authorized amount of company's common stock by board               $ 2,000,000,000 $ 500,000,000
Amount of shares bought (in shares) | shares   1.9 2.5            
Average price per share (in dollars per share) | $ / shares   $ 186.99 $ 196.20            
Authorized amount available for future repurchases   $ 1,600,000,000 $ 0     $ 1,600,000,000      
Treasury shares retired | shares   115.5              
Translation loss attributable to redeemable noncontrolling interest   $ 32,000,000       2,000,000 $ 39,000,000    
Net foreign currency translation losses attributable to noncontrolling interest         $ 13,000,000   $ 164,000,000    
Net actuarial gains (losses) attributable to redeemable noncontrolling interest   1,000,000       $ (5,000,000)      
Treasury Stock                  
Class of Stock [Line Items]                  
Retired amount of treasury shares previously repurchased   7,800,000,000              
Retained Earnings                  
Class of Stock [Line Items]                  
Retired amount of treasury shares previously repurchased   6,300,000,000              
Additional Paid-in Capital                  
Class of Stock [Line Items]                  
Retired amount of treasury shares previously repurchased   $ 1,500,000,000