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Long-Term Debt and Revolving Promissory Note (Details 2) - USD ($) $ in Millions					9 Months Ended
	Sep. 15, 2016	Aug. 29, 2016	Aug. 22, 2016	Jan. 29, 2016	Sep. 30, 2016	Sep. 30, 2015	May 02, 2016	Dec. 31, 2015
Long-term debt
Loss on early retirement of debt					$ 27	$ 0
Note payable - affiliate					884			$ 855
Senior notes | 6.5% Notes due 2056
Long-term debt
Debt instrument face amount			$ 978
Stated interest rate (percent)			6.50%
Debt instrument, face amount, over-allotment			$ 128
Proceeds from debt, net of issuance costs			$ 946
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 | 7.5% Notes due 2051
Long-term debt
Stated interest rate (percent)	7.50%
Debt instrument, repurchased face amount	$ 287
Loss on early retirement of debt	$ 9
Senior notes | 7.375% Notes Due 2051
Long-term debt
Stated interest rate (percent)		7.375%
Debt instrument, repurchased face amount		$ 661
Loss on early retirement of debt		$ 18
Senior notes | 8.375% Notes due 2016
Long-term debt
Stated interest rate (percent)							8.375%
Debt instrument, repurchased face amount							$ 235
Affiliated entity | Loans payable
Long-term debt
Line of credit, maximum borrowing capacity					1,000
Note payable - affiliate					$ 884			$ 855
Weighted average interest rate (percent)					6.795%
Accrued interest payable on affiliate note payable					$ 20
Debt instrument, redemption, period one | Senior notes | 6.5% Notes due 2056
Long-term debt
Debt instrument, redemption, period one			on or after September 1, 2021, at a redemption price equal to 100% of the principal amount redeemed
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

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