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Consolidating Financial Information - Textual (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
May 31, 2016
Additional Consolidating Financial Information (Textuals) [Abstract]      
Long term debt $ 5,805 $ 5,611  
Consolidating Financial Information (Textuals) [Abstract]      
Percentage of ownership over guarantor subsidiaries 100.00%    
Guarantor obligations, related party disclosure The notes are fully and unconditionally guaranteed on a joint and several basis by each guarantor subsidiary.    
Purchase of common shares of a non-guarantor subsidiary   145  
Capitalization of intercompany receivables for increase in equity of subsidiary   $ 90  
Non-guarantor subsidiaries, restrictions on remittance of funds Certain non-guarantor subsidiaries of the Parent Company are limited in their ability to remit funds to it by means of dividends, advances or loans due to required foreign government and/or currency exchange board approvals or limitations in credit agreements or other debt instruments of those subsidiaries.    
8.75% due 2020 | Senior Notes      
Additional Consolidating Financial Information (Textuals) [Abstract]      
Long-term debt, gross $ 282    
Interest rate, stated percentage 8.75% 8.75%  
Debt instrument, maturity date Aug. 15, 2020    
5% due 2026 | Senior Notes      
Additional Consolidating Financial Information (Textuals) [Abstract]      
Long term debt $ 900    
Interest rate, stated percentage 5.00% 5.00% 5.00%
Debt instrument, maturity date Mar. 01, 2026    
7% due 2022 | Senior Notes      
Additional Consolidating Financial Information (Textuals) [Abstract]      
Long term debt $ 700    
Interest rate, stated percentage 7.00% 7.00%  
Debt instrument, maturity date May 15, 2022    
5.125% due 2023 | Senior Notes      
Additional Consolidating Financial Information (Textuals) [Abstract]      
Long term debt $ 1,000    
Interest rate, stated percentage 5.125% 5.125%  
Debt instrument, maturity date Nov. 15, 2023