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Capital Stock (Details) - USD ($)
3 Months Ended 9 Months Ended 69 Months Ended
Oct. 09, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Feb. 02, 2017
Class of Stock [Line Items]              
Cash dividends paid       $ 100,000,000 $ 75,000,000    
Cash dividends declared (dollars per share)   $ 0.14 $ 0.1 $ 0.42 $ 0.3    
Payments for repurchase of stock       $ 200,000,000 $ 205,000,000    
Common Stock              
Class of Stock [Line Items]              
Cash dividends paid       $ 100,000,000      
Stock repurchase program, authorized amount             $ 2,100,000,000.0
Shares repurchased (shares)   4,188,492   8,039,584   52,009,241  
Average price of shares repurchased (dollars per share)   $ 23.87   $ 24.88   $ 29.10  
Payments for repurchase of stock   $ 100,000,000   $ 200,000,000   $ 1,514,000,000  
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