Fair Value Measurements (Details 3-Reported) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Other noncurrent financial assets	$ 154	$ 154
Total financial assets	154	154
Financial liabilities
Other current financial liabilities	13	13
Long-term debt, including current portion	7,020	6,922
Deferred credits and other financial liabilities	153	149
Financial Liabilities Fair Value Disclosure	7,186	7,084
Carrying Amount [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Other noncurrent financial assets	147	147
Total financial assets	147	147
Financial liabilities
Other current financial liabilities	13	13
Long-term debt, including current portion	6,427	6,427
Deferred credits and other financial liabilities	149	147
Financial Liabilities Fair Value Disclosure	$ 6,589	$ 6,587