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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Feb. 13, 2017
Apr. 21, 2017
Mar. 31, 2017
Mar. 25, 2016
Dec. 04, 2014
Class of Stock [Line Items]          
Number of common shares repurchased (in shares)     0    
Aggregate amount of repurchased shares       $ 198  
Cash dividends declared per common share (in dollars per share) $ 0.75   $ 0.75 $ 0.70  
Dividend declared date     Feb. 13, 2017    
Dividend paid date     Mar. 15, 2017    
Dividend paid, record date     Mar. 01, 2017    
Cash dividends     $ 61    
Accrued dividends through payment     2    
Treasury Stock [Member]          
Class of Stock [Line Items]          
Aggregate amount of repurchased shares       $ 198  
Share Repurchase Program December 4, 2014 [Member]          
Class of Stock [Line Items]          
Amount of shares authorized to be repurchased         $ 1,500
Remaining authorized amount of share repurchase programs     $ 433    
Share Repurchase Program December 4, 2014 [Member] | Treasury Stock [Member] | Subsequent Event [Member]          
Class of Stock [Line Items]          
Number of common shares repurchased (in shares)   66,462      
Average price per share of repurchased shares (in dollars per share)   $ 165.48      
Aggregate amount of repurchased shares   $ 11