Summarized Financial Data - Chevron U.S.A. Inc. - Summary of Income Statement Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues	[1]	$ 139,865	$ 158,902
Sales and other operating revenues	[1]			$ 134,674
Total costs and other deductions		140,980	145,764	132,501
Net Income (Loss) Attributable to Chevron Corporation		2,924	14,824	9,195
Chevron U.S.A. Inc.
Subsidiary Statements Captions [Line Items]
Sales and other operating revenues		109,314	125,076
Sales and other operating revenues				104,054
Total costs and other deductions		116,365	121,351	103,904
Net Income (Loss) Attributable to Chevron Corporation		$ (5,061)	$ 4,334	$ 4,842

[1] 2017 include excise, value-added and similar taxes of $7,189, 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 24, "Revenue" beginning on page 89.