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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jul. 19, 2017
Apr. 27, 2018
Mar. 30, 2018
Mar. 31, 2017
May 08, 2017
Class of Stock [Line Items]          
Aggregate amount of repurchased shares     $ 119    
Cash dividends declared per common share (in dollars per share) $ 0.80   $ 0.80 $ 0.75  
Dividend declared date     Feb. 12, 2018    
Dividend paid date     Mar. 15, 2018    
Dividend paid, record date     Mar. 01, 2018    
Cash dividends     $ 65    
Accrued dividends through payment     2    
Treasury Stock [Member]          
Class of Stock [Line Items]          
Aggregate amount of repurchased shares     $ 119    
Treasury Stock [Member] | Subsequent Event [Member]          
Class of Stock [Line Items]          
Aggregate amount of repurchased shares   $ 24      
Share Repurchase Program May 8, 2017 [Member]          
Class of Stock [Line Items]          
Amount of shares authorized to be repurchased         $ 1,500
Share Repurchase Program December 4, 2014 [Member] | Treasury Stock [Member]          
Class of Stock [Line Items]          
Number of common shares repurchased (in shares)     581,229    
Average price per share of repurchased shares (in dollars per share)     $ 203.93    
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)   116,581      
Average price per share of repurchased shares (in dollars per share)   $ 208.71