Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 14,860	$ 9,269	$ (431)
Currency translation adjustment
Unrealized net change arising during period	(19)	57	(22)
Unrealized holding gain (loss) on securities
Net gain (loss) arising during period	(5)	(3)	27
Actuarial gain (loss)
Amortization to net income of net actuarial loss and settlements	792	817	918
Actuarial gain (loss) arising during period	85	(571)	(315)
Prior service credits (cost)
Amortization to net income of net prior service costs and curtailments	(13)	(20)	19
Prior service (costs) credits arising during period	(26)	(1)	345
Defined benefit plans sponsored by equity affiliates - benefit (cost)	23	19	(19)
Income taxes on defined benefit plans	(230)	(44)	(505)
Total	631	200	443
Other Comprehensive Gain, Net of Tax	607	254	448
Comprehensive Income	15,467	9,523	17
Comprehensive income attributable to noncontrolling interests	(36)	(74)	(66)
Comprehensive Income (Loss) Attributable to Chevron Corporation	$ 15,431	$ 9,449	$ (49)

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