Debt (First Lien Notes) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt	$ 11,449		$ 11,112
First Lien Notes 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt	320	[1]	320	[1]
First Lien Notes 2020 [Member]
Debt Instrument [Line Items]
Long-term Debt	875	[2]	875	[2]
First Lien Notes 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt	1,600	[2]	1,600	[2]
2022 First Lien Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	745		744
First Lien Notes 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt	960		960
2024 First Lien Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	490		490
Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 4,990		$ 4,989

[1] The 2019 First Lien Notes were repaid on July 22, 2014 with a portion of the proceeds from the issuance of our Senior Unsecured Notes which are described in further detail below.

[2] On July 8, 2014, we launched tender offers and consent solicitations to repurchase our 2020 First Lien Notes and 2021 First Lien Notes with the proceeds from our Senior Unsecured Notes which are described in further detail below. On July 22, 2014, we repurchased approximately $861 million in aggregate principal amount of our 2020 First Lien Notes and approximately $1,582 million in aggregate principal amount of our 2021 First Lien Notes. We used the remaining net proceeds, together with cash on hand, to satisfy and discharge the remaining 2020 First Lien Notes and 2021 First Lien Notes.