Fair Value Measurements (Details 3-Reported) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Fair Value [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Other noncurrent financial assets		$ 109	$ 132
Total financial assets		109	132
Financial liabilities
Other current financial liabilities		15	13
Long-term debt, including current portion	[1]	8,302	6,887
Deferred credits and other financial liabilities		69	69
Financial Liabilities Fair Value Disclosure		8,386	6,969
Carrying Amount [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Other noncurrent financial assets		116	129
Total financial assets		116	129
Financial liabilities
Other current financial liabilities		14	13
Long-term debt, including current portion	[1]	8,324	6,360
Deferred credits and other financial liabilities		64	68
Financial Liabilities Fair Value Disclosure		$ 8,402	$ 6,441

[1] Excludes capital leases.