v3.3.1.900
Fair Value Measurements Fair Value Measurements (Details Textuals) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Long-term debt and current portion of long term debt, carrying value $ 8,023 $ 9,032
Long-term debt and current portion of long-term debt, fair value $ 8,231 $ 9,509