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Stockholders' Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2015
$ / shares
Dec. 31, 2016
USD ($)
vote
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
$ / shares
Dec. 31, 2016
USD ($)
vote
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
Oct. 31, 2016
USD ($)
Oct. 31, 2015
USD ($)
Equity, Class of Treasury 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 $ 0.28 $ 0.24 $ 0.84 $ 0.80    
Authorized stock repurchase amount (shares)             $ 4,000,000,000 $ 2,000,000,000
Stock repurchased during the period (shares) | shares   14,000,000 1,900,000   14,000,000      
Stock repurchased during the period         $ 2,000,000,000      
Average cost per share (dollars per share) | $ / shares   $ 140.96 $ 186.99   $ 140.96      
Treasury shares retired (shares) | shares     115,500,000          
Treasury shares retired during the year     $ 7,800,000,000          
Authorized amount available for future repurchases   $ 3,000,000,000     $ 3,000,000,000      
Net foreign currency translation gains (losses)   (30,000,000)     (95,000,000)      
Translation gain (loss) attributable to redeemable noncontrolling interest     (32,000,000)     $ (2,000,000)    
Amounts reclassified to income statement   0 0   20,000,000 0    
Net actuarial gains (losses) attributable to redeemable noncontrolling interest   (2,000,000) 1,000,000   (3,000,000) $ (5,000,000)    
Retained Earnings [Member]                
Equity, Class of Treasury Stock [Line Items]                
Treasury shares retired during the year     6,300,000,000          
Additional Paid-in Capital [Member]                
Equity, Class of Treasury Stock [Line Items]                
Treasury shares retired during the year     $ 1,500,000,000          
Foreign Currency Translation Adjustments, Net of Tax                
Equity, Class of Treasury Stock [Line Items]                
Net foreign currency translation gains (losses)   $ (31,000,000)     $ (97,000,000)