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Equity (Details) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended
Feb. 19, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 08, 2017
Class of Stock [Line Items]          
Aggregate amount of repurchased shares   $ 322,000,000 $ 180,000,000 $ 373,000,000  
Cash dividends declared per common share (in dollars per share)   $ 3.2 $ 3 $ 2.8  
Cash dividends   $ 254,000,000 $ 236,000,000 $ 220,000,000  
Previously accrued dividends for employee-held stock awards   1,000,000      
Subsequent Event [Member]          
Class of Stock [Line Items]          
Cash dividends declared per common share (in dollars per share) $ 0.85        
Dividend declared date Feb. 12, 2019        
Dividend paid date Mar. 15, 2019        
Dividend paid, record date Mar. 01, 2019        
Treasury Stock [Member]          
Class of Stock [Line Items]          
Aggregate amount of repurchased shares   $ 322,000,000 $ 180,000,000 $ 373,000,000  
Share Repurchase Program December 4, 2014 [Member] | Treasury Stock [Member]          
Class of Stock [Line Items]          
Number of common shares repurchased (in shares)   1.6      
Average price per share of repurchased shares (in dollars per share)   $ 196.64      
Aggregate amount of repurchased shares   $ 322,000,000      
Share Repurchase Program May 8, 2017 [Member]          
Class of Stock [Line Items]          
Amount of shares authorized to be repurchased         $ 1,500,000,000.0