Additional Financial Statement Information (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Cash Paid During the Year For [Abstract]
Interest, Net of Amount Capitalized	$ 107	$ 32		$ 66
Income Taxes Paid, Net	168	288		173
Non-Cash Financing and Investing Activities [Abstract]
Increase in CONSOL Installment Payments, Net of Discount	0	639	[1]	0
Increase in FPSO Lease Obligation	$ 0	$ 66	[1]	$ 266	[1]

[1] See Note 3. Acquisitions and Divestitures and Note 12. Long-Term Debt.