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Capital Stock (Details) - USD ($)
3 Months Ended 9 Months Ended 81 Months Ended
Oct. 07, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Feb. 02, 2017
Class of Stock [Line Items]              
Cash dividends paid       $ 111,000,000 $ 100,000,000    
Dividends Earned on Stock-based Compensation Plans       $ 1,000,000      
Cash dividends declared (dollars per share)   $ 0.16 $ 0.14 $ 0.48 $ 0.42    
Payments for repurchase of stock       $ 0 $ 200,000,000    
Common Stock              
Class of Stock [Line Items]              
Cash dividends paid       $ 111,000,000      
Stock repurchase program, authorized amount             $ 2,100,000,000
Shares repurchased (in 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 (in 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