Summarized Financial Data - Chevron Transport Corporation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	$ 59,780	$ 66,671	$ 118,676	$ 125,083
Costs and other deductions	50,253	55,741	98,889	104,960
Net income	7,210	7,732	13,681	13,943
Chevron Transport Corporation [Member]
Summarized Financial Data - Chevron Transport Corporation
Sales and other operating revenues	193	196	394	422
Costs and other deductions	214	227	452	489
Net income	$ (21)	$ (32)	$ (56)	$ (67)