Debt Debt (First Lien Term Loans) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 11,112		$ 10,750
First Lien Term Loans 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt	1,614		1,630
Debt Instrument, Interest Rate, Effective Percentage	4.30%	[1]	4.70%	[1]
First Lien Term Loan 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt	824		833
Debt Instrument, Interest Rate, Effective Percentage	4.50%	[1]	4.70%	[1]
2020 First Lien Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt	390		0
Debt Instrument, Interest Rate, Effective Percentage	4.30%	[1]	0.00%	[1]
First Lien Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 2,828		$ 2,463

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