Long-Term Debt (8.875% Senior Notes, Due 2015 Narrative) (Details) (Senior Notes at 8.875, Due 2015 [Member], Senior Notes [Member], USD $)	1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended
	Jul. 31, 2007	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 December 7, 2011 Cash Tender Offer [Member]	Mar. 31, 2012 March 21, 2012 Cash Tender Offer [Member]	Aug. 31, 2012 July 18, 2012 Cash Tender Offer and August 17, 2012 Redemption Option Exercise [Member]	Jul. 31, 2012 July 18, 2012 Cash Tender Offer and August 17, 2012 Redemption Option Exercise [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Jul. 15, 2015
Debt Instrument, Face Amount	$ 3,000,000,000
Debt Instrument, Interest Rate, Stated Percentage	8.875%
Debt Extinguishment Date				Dec. 07, 2011	Mar. 21, 2012	Aug. 17, 2012	Jul. 18, 2012
Extinguishment of Debt, Amount		850,000,000	1,000,000,000	1,000,000,000	850,000,000	294,600,000	639,700,000
Debt Outstanding, Prior to Entinguishment of Portion				$ 2,800,000,000	$ 1,800,000,000	$ 294,600,000	$ 934,300,000
Debt Instrument, Earliest Redemption Date	Jul. 15, 2011
Minimum Period Notice for Redemption of Debt	30 days
Maximum Period Notice for Redemption of Debt	60 days
Period Subject to Redemption Price Commencing on Scheduled Date	12 months