Summarized Financial Data - Chevron Transport Corporation (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Balance Sheet - Chevron Transport Corporation
Current assets	$ 58,465	$ 53,234
Current liabilities	35,669	33,600
Total Equity	134,222	122,181	121,676	105,811
Chevron Transport Corporation [Member]
Balance Sheet - Chevron Transport Corporation
Current assets	237	290
Other assets	256	228
Current liabilities	134	114
Other liabilities	415	346
Total Equity	$ (56)	$ 58