Summarized Financial Data - Chevron Transport Corporation (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Balance Sheet - Chevron Transport Corporation
Current assets	$ 54,696	$ 55,720
Current liabilities	34,685	34,212
Total Equity	141,486	137,832	126,326	122,181
Chevron Transport Corporation [Member]
Balance Sheet - Chevron Transport Corporation
Current assets	212	199
Other assets	312	313
Current liabilities	210	154
Other liabilities	414	415
Total Equity	$ (100)	$ (57)

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