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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Long-term debt    
Capital lease and other obligations $ 17 $ 17
Unamortized premiums, net 11 16
Unamortized debt issuance costs (131) (123)
Total long-term debt 7,461 7,239
Less current maturities (243) (242)
Long-term debt, excluding current maturities 7,218 6,997
Note payable - affiliate 855 855
Senior notes    
Long-term debt    
Long-term debt, gross $ 7,464 7,229
Senior notes | Minimum    
Long-term debt    
Stated interest rate (percent) 6.125%  
Senior notes | Maximum    
Long-term debt    
Stated interest rate (percent) 8.375%  
Medium-term loan    
Long-term debt    
Long-term debt, gross $ 100 100
Interest rate at end of period - Term loan (percent) 2.19%  
Note payable - affiliate | Loans payable | Affiliated entity    
Long-term debt    
Weighted average interest rate (percent) 6.758%  
Note payable - affiliate $ 855 $ 855