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Long-Term Debt and Revolving Promissory Note (Details 2) - USD ($)
$ in Millions
Jan. 31, 2016
Jun. 30, 2016
May 02, 2016
Senior notes | 7.00% Notes due 2056      
Long-term debt      
Debt instrument face amount $ 235    
Stated interest rate (percent) 7.00%    
Proceeds from debt, net of issuance costs $ 227    
Senior notes | 8.375% Notes due 2016      
Long-term debt      
Stated interest rate (percent)     8.375%
Face amount of repurchased debt     $ 235
Affiliated entity | Loans payable | Note payable - affiliate      
Long-term debt      
Line of credit, maximum borrowing capacity   $ 1,000  
Note payable - affiliate   $ 884  
Weighted average interest rate (percent)   6.795%  
Accrued interest payable on affiliate note payable   $ 5  
Debt Instrument, Redemption, Period One | Senior notes | 7.00% Notes due 2056      
Long-term debt      
Debt instrument, redemption, period one on or after February 1, 2021, at a redemption price equal to 100% of the principal amount redeemed