Other Contingencies and Commitments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Location	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Guarantees
Guarantee for payments under terminal use agreements	$ 562
Term of guarantee for payments under terminal use agreement (in years)	15 years
Idemnifications
Indemnifications Equilon Motiva YTD payments made since 2002	48
Indemnifications Equilon Motiva maximum future payments	250
Indemnifications acquirer environmental liabilities, maximum obligation				200
Long-Term Unconditional Purchase Obligations and Commitments, Including Throughput and Take-or-Pay Agreements
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2013	3,700
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	4,100
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2016	2,400
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2017	1,800
Long term unconditional purchase obligations and commitments, including throughout and take or pay agreements in 2018 and after	6,500
Total payments under long term unconditional purchase obligations and commitments including throughput and Take-or-Pay agreements	3,600	6,600	6,500
Environmental
Environmental reserve balance	1,403
Sites with potential remediation activities	175
Upstream [Member]
Environmental
Environmental reserve	309
U.S. Downstream [Member]
Environmental
Environmental reserve	782
International Downstream [Member]
Environmental
Environmental reserve	93
Other Businesses [Member]
Environmental
Environmental reserve	62
Sites with Potential Remediation Activities [Member]
Environmental
Environmental reserve	157
Environmental Reserve Less Environmental Reserve for Sites with Potential Remediation Activities [Member]
Environmental
Environmental reserve	1,246
Non U.S. Downstream [Member]
Environmental
Environmental reserve	$ 464