Long-Term Debt - Schedule of Long Term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Long-term debt
Total Debt Obligations	$ 8,780		$ 8,528
Total Unamortized (Discount) Premium	(48)		(78)
Carrying Value of Debt	8,732		8,450
Less current portion	(216)		(65)
Long-Term Debt, less current portion	8,516		8,385
Term Loans
Long-term debt
Total Debt Obligations	2,614	[1]	2,600	[1]
Total Unamortized (Discount) Premium	(11)		(33)
Senior Notes due 2014 (9.25%)
Long-term debt
Total Debt Obligations	0		807
Total Unamortized (Discount) Premium	0		3
Floating Rate Senior Notes due 2015
Long-term debt
Total Debt Obligations	300		300
Senior Notes due 2017 (8.75%)
Long-term debt
Total Debt Obligations	0		700
Senior Notes due 2018 (10.0%)
Long-term debt
Total Debt Obligations	640		640
Total Unamortized (Discount) Premium	(10)		(11)
Senior Notes due 2019 (11.875%)
Long-term debt
Total Debt Obligations	605		605
Total Unamortized (Discount) Premium	(9)		(10)
Senior Notes due 2019 (9.375%)
Long-term debt
Total Debt Obligations	500		500
Total Unamortized (Discount) Premium	(8)		(9)
Senior Notes due 2019 (8.125%)
Long-term debt
Total Debt Obligations	1,200		1,200
Total Unamortized (Discount) Premium	(8)		(9)
Senior Notes due 2019 (8.875%)
Long-term debt
Total Debt Obligations	300		0
Senior Notes due 2020 (8.625%)
Long-term debt
Total Debt Obligations	900		0
Senior Notes due 2020 (7.0%)
Long-term debt
Total Debt Obligations	775		0
Convertible Senior Notes due 2013 (15.0%)
Long-term debt
Total Debt Obligations	172		272
Total Unamortized (Discount) Premium	0		(7)
Convertible Senior Notes due 2015 (7.0%)
Long-term debt
Total Debt Obligations	200		200
Total Unamortized (Discount) Premium	(2)		(2)
Convertible Senior Notes due 2015 Series B (7.0%)
Long-term debt
Total Debt Obligations	275		275
Convertible Senior Notes due 2016 (6.5%)
Long-term debt
Total Debt Obligations	201		201
Commercial Mortgage due 2015 (9.86%)
Long-term debt
Total Debt Obligations	0		65
Capital Leases
Long-term debt
Total Debt Obligations	86		131
Other
Long-term debt
Total Debt Obligations	$ 12		$ 32

[1] * The $599 million Tranche B 2016 Term Loan due 2016, the $815 million Tranche B 2019 Term Loan due 2019 and the $1.2 billion Tranche B-II 2019 Term Loan due 2019 had interest rates of 4.75%, 5.25% and 4.75% as of December 31, 2012, respectively. The $1.4 billion Tranche A Term Loan due 2014, that was prepaid in 2012, had an effective interest rate of 2.65% as of December 31, 2011, excluding the effect of the $1 billion notional amount interest rate swaps. The $650 million Tranche B II Term Loan and $550 million Tranche B III Term Loan due 2018, that were prepaid in 2012, had interest rates of 5.75% as of December 31, 2011.