CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 4,056	$ 1,986	$ 11,137	$ 6,151
Currency translation adjustment	(2)	13	(12)	37
Unrealized holding gain (loss) on securities:
Net gain (loss) arising during period	1	(2)	(6)	(7)
Actuarial gain (loss):
Amortization to net income of net actuarial and settlement losses	214	264	522	609
Actuarial gain (loss) arising during period	(92)	3	(94)	(11)
Prior service cost:
Amortization to net income of net prior service costs (credits)	(2)	(5)	(9)	(15)
Defined benefit plans sponsored by equity affiliates	5	5	18	15
Income tax expense on defined benefit plans	(21)	(96)	(95)	(207)
Total	104	171	342	391
Other Comprehensive Gain, Net of Tax	103	182	324	421
Comprehensive Income	4,159	2,168	11,461	6,572
Comprehensive income attributable to noncontrolling interests	(9)	(34)	(43)	(67)
Comprehensive Income Attributable to Chevron Corporation	$ 4,150	$ 2,134	$ 11,418	$ 6,505