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Capital Stock (Details) - USD ($)
3 Months Ended 6 Months Ended 33 Months Ended
Sep. 01, 2016
Aug. 01, 2016
Jul. 12, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Feb. 04, 2016
May 27, 2014
Sep. 18, 2013
Class of Stock [Line Items]                      
Cash dividends paid           $ 38,000,000 $ 32,000,000        
Cash dividends declared (dollars per share)       $ 0.07 $ 0.06 $ 0.14 $ 0.12        
Payments for repurchase of stock           $ 150,000,000 $ 52,000,000        
Common Stock                      
Class of Stock [Line Items]                      
Cash dividends paid           $ 38,000,000          
Stock repurchase program, authorized amount                 $ 1,100,000,000.0 $ 450,000,000 $ 100,000,000
Shares repurchased       3,571,254   5,162,630   19,670,348      
Average price of shares repurchased (dollars per share)       $ 28.00   $ 29.05   $ 28.64      
Payments for repurchase of stock       $ 100,000,000   $ 150,000,000   $ 563,000,000      
Subsequent Event | Common Stock                      
Class of Stock [Line Items]                      
Cash dividends declared, date declared     Jul. 12, 2016                
Cash dividends declared (dollars per share)     $ 0.07                
Cash dividends declared     $ 18,000,000                
Dividends payable, date of record   Aug. 01, 2016                  
Scenario, Forecast | Common Stock                      
Class of Stock [Line Items]                      
Dividends payable, date to be paid Sep. 01, 2016