Other Contingencies and Commitments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Location	Dec. 31, 2010	Dec. 31, 2009
Other Contingencies and Commitments (Textual) [Abstract]
Guarantee for payments under Terminal use agreements	$ 600
Term of guarantee for payments under Terminal Use Agreement (in years)	Approximate 16 year term
Indemnifications Equilon Motiva YTD payments made since 2002	48
Indemnifications Equilon Motiva max future payments	250
Indemnifications Acquirer Environmental Liabilities Max Obligation			200
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2012	6,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2013	4,000
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2014	3,900
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2015	3,200
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2016	1,900
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2017 and after	7,400
Payments made under long term unconditional purchase obligations and commitments including throughput and Take or Pay Agreements	6,600	6,500	8,100
Environmental reserve balance	1,404
Sites with potential remediation activities	180
Upstream [Member]
Other Contingencies and Commitments [Line Items]
Environmental reserve	368
U.S. Downstream [Member]
Other Contingencies and Commitments [Line Items]
Environmental reserve	675
International Downstream [Member]
Other Contingencies and Commitments [Line Items]
Environmental reserve	95
Other Businesses [Member]
Other Contingencies and Commitments [Line Items]
Environmental reserve	81
Sites with Potential Remediation Activities [Member]
Other Contingencies and Commitments [Line Items]
Environmental reserve	185
Environmental Reserve Less Environmental Reserve for Sites with Potential Remediation Activities [Member]
Other Contingencies and Commitments [Line Items]
Environmental reserve	1,219
Non U.S. Downstream [Member]
Other Contingencies and Commitments [Line Items]
Environmental reserve	$ 544