Fair Value Measurements (Details 3-Reported) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Fair Value [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Other noncurrent financial assets		$ 115	$ 104
Total financial assets		115	104
Financial liabilities
Other current financial liabilities		34	34
Long-term debt, including current portion	[1]	6,575	6,723
Deferred credits and other financial liabilities		104	97
Financial Liabilities Fair Value Disclosure		6,713	6,854
Carrying Amount [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Other noncurrent financial assets		120	118
Total financial assets		120	118
Financial liabilities
Other current financial liabilities		33	33
Long-term debt, including current portion	[1]	7,291	7,291
Deferred credits and other financial liabilities		105	95
Financial Liabilities Fair Value Disclosure		$ 7,429	$ 7,419

[1] Excludes capital leases, debt issuance costs and interest rate swap adjustments.