Long-Term Debt and Revolving Promissory Note (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of long-term debt, including unamortized discounts and premiums

Long-term debt, including unamortized discounts and premiums and note payable-affiliate, were as follows:

			As of December 31,
	Interest Rates	Maturities	2014			2013
			(Dollars in millions)
Senior notes	6.125% - 8.375%	2015 - 2054	$	7,311		7,411
Capital lease and other obligations	Various	Various	32			72
Unamortized premiums, net			36			75
Total long-term debt			7,379			7,558
Less current maturities			(117		)	(637	)
Long-term debt, excluding current maturities			$	7,262		6,921
Note payable-affiliate	6.657%	2022	$	796		754

Schedule of aggregate maturities of the entity's long-term debt (excluding unamortized premiums, discounts, and other)

Aggregate maturities of our long-term debt (excluding unamortized premiums, discounts and other and excluding note payable-affiliate):

	(Dollars in millions)(1)
2015	$	117
2016	237
2017	500
2018	—
2019	—
2020 and thereafter	6,489
Total long-term debt	$	7,343

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⁽¹⁾ Actual principal paid in all years may differ due to the possible future refinancing of outstanding debt or the issuance of new debt.

Schedule of amount of gross interest expense, net of capitalized interest and interest expense (income)-affiliates

Interest expense includes interest on long-term debt. The following table presents the amount of gross interest expense, net of capitalized interest and interest expense-affiliates, net:

	Years Ended December 31,
	2014			2013		2012
	(Dollars in millions)
Interest expense:
Gross interest expense	$	481		467		461
Capitalized interest	(17		)	(17	)	(18	)
Total interest expense	$	464		450		443
Interest expense-affiliates, net	$	40		64		24