v3.2.0.727
Debt (First Lien Notes) (Details) - Debt Instrument, Name [Domain] - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term Debt $ 11,398 $ 11,122
2022 First Lien Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt 745 745
First Lien Notes 2023 [Member]    
Debt Instrument [Line Items]    
Long-term Debt [1] 693 840
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 $ 1,928 $ 2,075
[1] On February 3, 2015, we repurchased approximately $147 million of our 2023 First Lien Notes with the proceeds from our 2024 Senior Unsecured Notes, as described in further detail above.