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Capital Stock (Details) - USD ($)
3 Months Ended 75 Months Ended
Apr. 08, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Feb. 02, 2017
Class of Stock [Line Items]          
Cash dividends paid   $ 37,000,000 $ 34,000,000    
Cash dividends declared (dollars per share)   $ 0.16 $ 0.14    
Payments for repurchase of stock   $ 0 $ 25,000,000    
Common Stock          
Class of Stock [Line Items]          
Cash dividends paid   $ 37,000,000      
Stock repurchase program, authorized amount         $ 2,100,000,000.0
Shares repurchased (shares)       52,905,959  
Average price of shares repurchased (dollars per share)       $ 28.99  
Payments for repurchase of stock       $ 1,534,000,000  
Common Stock | Payments for Share Repurchases Related to Employee Stock Based Compensation          
Class of Stock [Line Items]          
Shares repurchased (shares)   0      
Common Stock | Subsequent Event          
Class of Stock [Line Items]          
Cash dividends declared (dollars per share) $ 0.16        
Cash dividends declared $ 37,000,000