Debt (First Lien Term Loans) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 10,777	$ 10,750
First Lien Term Loans 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt	1,625	1,630
First Lien Term Loan 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt	831	833
First Lien Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 2,456	$ 2,463

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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