Fair Value Measurements and Disclosures (Details 3) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt Net Of Unamortized Discount	$ 4,273	[1]	$ 3,797	[1]
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long Term Debt Net Of Unamortized Discount	$ 4,778	[1]	$ 4,570	[1]

[1] ) Excludes FPSO and other capital lease obligations.