Debt (Debt Extinguishment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2012 Notes Interest Rates Ranging From 7.82% to 7.95% Due From 2012 To 2018 [Member]	Mar. 31, 2012 Notes Interest Rates Ranging From 6.2% to 9.375% Due From 2018 To 2025 [Member]	Dec. 31, 2011 Notes Interest Rates Ranging From 6.2% to 9.375% Due From 2018 To 2025 [Member]
Extinguishment of Debt [Line Items]
Debt reductions	$ 30	[1]	$ 129	[1]
Pre-tax early debt extinguishment costs	$ 4	[2]	$ 32	[2]
Interest rates range, minimum					7.82%		6.20%
Interest rates range, maximum					7.95%		9.375%
Original maturity date range, minimum					2012	2018
Original maturity date range, maximum					2018	2025

[1] Reductions related to notes with interest rates ranging from 7.82% to 7.95% with original maturities from 2012 to 2018 and from 6.2% to 9.375% with original maturities from 2018 to 2025 for the three months ended March 31, 2012 and 2011, respectively.

[2] Amounts are included in Restructuring and Other Charges in the accompanying consolidated statements of operations.