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Long-Term Debt and Revolving Promissory Note (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Long-term debt    
Capital lease and other obligations $ 28 $ 17
Unamortized premiums, net 8 16
Unamortized debt issuance costs (130) (123)
Total long-term debt 7,235 7,239
Less current maturities (509) (242)
Long-term debt, excluding current maturities 6,726 6,997
Note payable - affiliate 884 855
Senior notes    
Long-term debt    
Long-term debt, gross $ 7,229 7,229
Senior notes | Minimum    
Long-term debt    
Stated interest rate (percent) 6.125%  
Senior notes | Maximum    
Long-term debt    
Stated interest rate (percent) 7.75%  
Term loan    
Long-term debt    
Long-term debt, gross $ 100 100
Interest rate at end of period - Term loan (percent) 2.22%  
Note payable - affiliate | Loans payable | Affiliated entity    
Long-term debt    
Weighted average interest rate (percent) 6.795%  
Note payable - affiliate $ 884 $ 855