Other Contingencies and Commitments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2009
Other Contingencies and Commitments (Textual) [Abstract]
Indemnifications Equilon Motiva YTD payments made since 2002	$ 48
Indemnifications Equilon Motiva max future payments	250
Indemnifications Acquirer Environmental Liabilities Max Obligation		$ 200
Indemnification expires	2022-04