Fair Value Measurements (Details 3-Reported) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Estimate of Fair Value Measurement [Member]
Financial assets
Other noncurrent financial assets	$ 132		$ 154
Total financial assets	132		154
Financial liabilities
Other current financial liabilities	13		13
Long-term debt, including current portion(a)	6,887	[1]	6,922	[1]
Deferred credits and other liabilities	69		149
Financial Liabilities Fair Value Disclosure	6,969		7,084
Reported Value Measurement [Member]
Financial assets
Other noncurrent financial assets	129		147
Total financial assets	129		147
Financial liabilities
Other current financial liabilities	13		13
Long-term debt, including current portion(a)	6,360	[1]	6,427	[1]
Deferred credits and other liabilities	68		147
Financial Liabilities Fair Value Disclosure	$ 6,441		$ 6,587

[1] Excludes capital leases