Summarized Financial Data - Chevron U.S.A. Inc. - Summary of Income Statement Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues	[1]	$ 158,902
Sales and other operating revenues	[1]		$ 134,674	$ 110,215
Total costs and other deductions		145,764	132,501	116,632
Net Income (Loss) Attributable to Chevron Corporation		14,824	9,195	(497)
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues		125,076
Sales and other operating revenues			104,054	83,715
Total costs and other deductions		121,351	103,904	87,429
Net Income (Loss) Attributable to Chevron Corporation		$ 4,334	$ 4,842	$ (1,177)

[1] 2017 and 2016 include excise, value-added and similar taxes of $7,189 and $6,905, respectively, collected on behalf of third parties. Beginning in 2018, these taxes are netted in "Taxes other than on income" in accordance with Accounting Standards Update (ASU) 2014-09. Refer to Note 25, "Revenue" beginning on page 88.