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Income Taxes - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jan. 01, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jul. 31, 2013
Income tax expense (benefit)     $ 13,000,000 $ (77,000,000) $ 66,000,000 $ (10,000,000)  
US federal statutory income tax rate     35.00% 35.00% 35.00% 35.00%  
Amortization of prepaid tax asset         $ 8,000,000    
Effective income tax rate         26.00% 37.00%  
Expense related to future taxes on repatriations from operations     $ 1,000,000 $ 1,000,000 $ 5,000,000 $ 4,000,000  
Withholding tax related to actual transfer of funds     $ 2,000,000 1,000,000 $ 4,000,000 7,000,000  
Possible release of valuation allowance   $ (32,000,000)   $ 100,000,000   $ 100,000,000  
Senior Notes Sold In 2013 [Member]              
Senior notes issued             $ 750,000,000
Scenario, Forecast [Member]              
Possible release of valuation allowance $ 500,000,000