CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 1,398	$ 3,581
Currency translation adjustment	(19)	(19)
Unrealized holding gain (loss) on securities
Net gain (loss) arising during period	(3)	(3)
Actuarial gain (loss)
Amortization to net income of net actuarial loss and settlements	435	166
Actuarial gain (loss) arising during period	907	0
Prior service credits (cost)
Amortization to net income of net prior service costs and curtailments	(4)	(3)
Prior service (costs) credits arising during period	0	0
Defined benefit plans sponsored by equity affiliates - benefit (cost)	11	2
Income (taxes) benefit on defined benefit plans	(301)	(37)
Total	1,048	128
Other Comprehensive Gain (Loss), Net of Tax	1,026	106
Comprehensive Income (Loss)	2,424	3,687
Comprehensive loss (income) attributable to noncontrolling interests	(21)	18
Comprehensive Income (Loss) Attributable to Chevron Corporation	$ 2,403	$ 3,705