v3.3.1.900
Debt (Annual Debt Marturities) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Long-term Debt, Fiscal Year Maturity [Abstract]    
2016 $ 222  
2017 210  
2018 234  
2019 1,618  
2020 1,372  
Thereafter 8,464  
Total debt, gross 12,120  
Less: Discount 31  
Debt and Capital Lease Obligations $ 12,089 $ 11,282