v3.4.0.3
Debt (First Lien Notes) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt $ 11,674 $ 11,292
2022 First Lien Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt 738 737
First Lien Notes 2023 [Member]    
Debt Instrument [Line Items]    
Long-term Debt 568 568
2024 First Lien Notes [Member]    
Debt Instrument [Line Items]    
Long-term Debt 484 484
Corporate Debt Securities [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 1,790 $ 1,789