Long-Term Debt - Schedule of Long Term Debt (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Long-term debt
Total Debt Obligations	$ 8,502	$ 8,528
Total Unamortized (Discount) Premium	(76)	(78)
Carrying Value of Debt	8,426	8,450
Less current portion	(227)	(65)
Long-Term Debt, less current portion	8,199	8,385
Senior Notes due 2014 (9.25%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	9.25%
Senior Notes due 2019 (11.875%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	11.875%
Senior Notes due 2019 (8.125%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	8.125%
Senior Notes due 2020 (8.625%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	8.625%
Convertible Senior Notes due 2013 (15.0%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	15.00%
Convertible Senior Notes due 2015 (7.0%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Convertible Senior Notes due 2015 Series B (7.0%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Convertible Senior Notes due 2016 (6.5%)
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Other
Long-term debt
Total Debt Obligations	30	32
Embedded derivative contracts
Long-term debt
Total Unamortized (Discount) Premium	(4)	(7)
Term Loans | Senior Secured Term Loan
Long-term debt
Total Debt Obligations	2,600	2,600
Total Unamortized (Discount) Premium	(32)	(33)
Term Loans | Senior Secured Term Loan | Tranche A Term Loan
Long-term debt
Total Debt Obligations	1,400
Term Loans | Senior Secured Term Loan | Tranche-A Term Loan One Billion Dollars
Long-term debt
Total Debt Obligations	1,000
Term Loans | Senior Secured Term Loan | Tranche-B II Term Loan Six Hundred Fifty Million Dollars
Long-term debt
Total Debt Obligations	650
Debt Instrument, Interest Rate at Period End	5.75%	5.75%
Term Loans | Senior Secured Term Loan | Tranche-B III Term Loan Five Hundred Fifty Million Dollars
Long-term debt
Total Debt Obligations	550
Debt Instrument, Interest Rate at Period End	5.75%	5.75%
Senior Notes | Senior Notes due 2014 (9.25%)
Long-term debt
Total Debt Obligations	0	807
Total Unamortized (Discount) Premium	0	3
Debt Instrument, Interest Rate, Stated Percentage	9.25%
Senior Notes | Floating Rate Senior Notes due 2015 [Member]
Long-term debt
Total Debt Obligations	300	300
Debt Instrument, Interest Rate at Period End	4.506%	4.202%
Senior Notes | Senior Notes due 2017 (8.75%)
Long-term debt
Total Debt Obligations	700	700
Debt Instrument, Interest Rate, Stated Percentage	8.75%
Senior Notes | Senior Notes due 2018 (10.0%)
Long-term debt
Total Debt Obligations	640	640
Total Unamortized (Discount) Premium	(10)	(11)
Debt Instrument, Interest Rate, Stated Percentage	10.00%
Senior Notes | Senior Notes due 2019 (11.875%)
Long-term debt
Total Debt Obligations	605	605
Total Unamortized (Discount) Premium	(10)	(10)
Debt Instrument, Interest Rate, Stated Percentage	11.875%
Senior Notes | Senior Notes due 2019 (9.375%)
Long-term debt
Total Debt Obligations	500	500
Total Unamortized (Discount) Premium	(9)	(9)
Debt Instrument, Interest Rate, Stated Percentage	9.375%
Senior Notes | Senior Notes due 2019 (8.125%)
Long-term debt
Total Debt Obligations	1,200	1,200
Total Unamortized (Discount) Premium	(9)	(9)
Debt Instrument, Interest Rate, Stated Percentage	8.125%
Senior Notes | Senior Notes due 2020 (8.625%)
Long-term debt
Total Debt Obligations	900	0
Debt Instrument, Interest Rate, Stated Percentage	8.625%
Convertible Senior Notes | Convertible Senior Notes due 2013 (15.0%)
Long-term debt
Total Debt Obligations	172	272
Debt Instrument, Interest Rate, Stated Percentage	15.00%
Convertible Senior Notes | Convertible Senior Notes due 2015 (7.0%)
Long-term debt
Total Debt Obligations	200	200
Total Unamortized (Discount) Premium	(2)	(2)
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Convertible Senior Notes | Convertible Senior Notes due 2015 Series B (7.0%)
Long-term debt
Total Debt Obligations	275	275
Debt Instrument, Interest Rate, Stated Percentage	7.00%
Convertible Senior Notes | Convertible Senior Notes due 2016 (6.5%)
Long-term debt
Total Debt Obligations	201	201
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Commercial Mortgage | Commercial Mortgage due 2015 (9.86%)
Long-term debt
Total Debt Obligations	64	65
Debt Instrument, Interest Rate, Stated Percentage	9.86%
Capital Leases
Long-term debt
Total Debt Obligations	$ 115	$ 131