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Capital Stock (Details) - USD ($)
3 Months Ended 6 Months Ended 66 Months Ended
Jul. 14, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Feb. 02, 2017
Class of Stock [Line Items]              
Cash dividends paid       $ 67,000,000 $ 50,000,000    
Cash dividends declared (dollars per share)   $ 0.14 $ 0.10 $ 0.28 $ 0.2    
Payments for repurchase of stock       $ 100,000,000 $ 30,000,000    
Common Stock              
Class of Stock [Line Items]              
Cash dividends paid       $ 67,000,000      
Stock repurchase program, authorized amount             $ 2,100,000,000.0
Shares repurchased (shares)   2,976,414   3,851,092   47,820,749  
Average price of shares repurchased (dollars per share)   $ 25.20   $ 25.97   $ 29.56  
Payments for repurchase of stock   $ 75,000,000   $ 100,000,000   $ 1,413,000,000  
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) $ 0.14            
Cash dividends declared $ 33,000,000