Debt Debt (First Lien Term Loans) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Long-term Debt	$ 10,750		$ 10,425
First Lien Term Loans 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt	1,630		1,646
Debt Instrument, Interest Rate, Effective Percentage	4.70%	[1]	4.70%	[1]
First Lien Term Loan 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt	833		0
Debt Instrument, Interest Rate, Effective Percentage	4.70%	[1]	0.00%	[1]
First Lien Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 2,463		$ 1,646

[1] Our weighted average interest rate calculation includes the amortization of deferred financing costs and debt discount.