Debt Debt (First Lien Notes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 11,112		$ 10,750
First Lien Notes 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	0.00%	[1]	7.50%	[1]
Long-term Debt	0	[2]	1,080	[2]
First Lien Notes 2017 [Member] | Early Tender Amount [Member]
Debt Instrument [Line Items]
Long-term Debt	742
First Lien Notes 2017 [Member] | Remaining Tender Amount [Member] [Member]
Debt Instrument [Line Items]
Long-term Debt	338
First Lien Notes 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	8.20%	[1]	8.20%	[1]
Long-term Debt	320	[3]	360	[3]
First Lien Notes 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	8.20%	[1]	8.10%	[1]
Long-term Debt	875	[3]	983	[3]
First Lien Notes 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	7.70%	[1]	7.70%	[1]
Long-term Debt	1,600	[3]	1,800	[3]
2022 First Lien Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	6.20%	[1]	0.00%	[1]
Long-term Debt	744	[2]	0	[2]
First Lien Notes 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	8.00%	[1]	8.00%	[1]
Long-term Debt	960	[3]	1,080	[3]
Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Long-term Debt	4,989		5,303
2024 First Lien Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	5.90%	[1]	0.00%	[1]
Long-term Debt	$ 490	[3]	$ 0	[3]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	10.00%
Debt Instrument, Redemption Price, Percentage	103.00%

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

[2] On October 17, 2013, we launched a tender offer to repay our 2017 First Lien Notes with the proceeds from our 2020 First Lien Term Loan and 2022 First Lien Notes which are described in further detail below. On October 31, 2013, following the early tender and consent date of the tender offer, we purchased approximately $742 million in aggregate principal amount of our 2017 First Lien Notes and issued a redemption notice to the remaining holders of our 2017 First Lien Notes that did not tender their notes in the tender offer. The tender offer expired on November 29, 2013 and we purchased the remaining $338 million in aggregate principal amount of our 2017 First Lien Notes tendered prior to the expiration of the tender offer, and redeemed any remaining 2017 First Lien Notes on December 2, 2013.

[3] On October 31, 2013, we issued $490 million in aggregate principal amount of our 2024 First Lien Notes and used the proceeds to redeem 10% of the original aggregate principal amount of our 2019 First Lien Notes, 2020 First Lien Notes, 2021 First Lien Notes and 2023 First Lien Notes at a redemption price of 103% of the principal amount redeemed, plus accrued and unpaid interest.