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Short And Long-Term Debt - First and a Half Lien Notes (Details) (Collateralized Lien Obligations [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012 Existing First and Half Lien Notes [Member]	Dec. 31, 2011 Existing First and Half Lien Notes [Member]	Feb. 03, 2011 Existing First and Half Lien Notes [Member]	Sep. 30, 2012 New First and Half Lien Notes [Member]	Feb. 02, 2012 New First and Half Lien Notes [Member]	Dec. 31, 2011 New First and Half Lien Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 700	$ 700	$ 700	$ 325	$ 325	$ 0
Interest rate, stated percentage	7.875%			9.00%

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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