Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 9,269	$ (431)	$ 4,710
Currency translation adjustment
Unrealized net change arising during period	57	(22)	(44)
Unrealized holding (loss) gain on securities
Net (loss) gain arising during period	(3)	27	(21)
Actuarial gain (loss)
Amortization to net income of net actuarial loss and settlements	817	918	794
Actuarial (loss) gain arising during period	(571)	(315)	109
Prior service credits (cost)
Amortization to net income of net prior service costs and curtailments	(20)	19	30
Prior service (costs) credits arising during period	(1)	345	6
Defined benefit plans sponsored by equity affiliates - benefit (cost)	19	(19)	30
Income taxes on defined benefit plans	(44)	(505)	(336)
Total	200	443	633
Other Comprehensive Gain, Net of Tax	254	448	568
Comprehensive Income	9,523	17	5,278
Comprehensive income attributable to noncontrolling interests	(74)	(66)	(123)
Comprehensive Income (Loss) Attributable to Chevron Corporation	$ 9,449	$ (49)	$ 5,155