Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net Income	$ 26,336	$ 27,008	$ 19,136
Currency translation adjustment
Unrealized net change arising during period	23	17	6
Unrealized holding gain (loss) on securities
Net gain (loss) arising during period	1	(11)	(4)
Derivatives
Net derivatives gain on hedge transactions	20	20	25
Reclassification to net income of net realized (gain) loss	(14)	9	5
Income taxes on derivatives transactions	(3)	(10)	(10)
Total	3	19	20
Actuarial loss
Amortization to net income of net actuarial loss	920	773	635
Actuarial loss arising during period	(1,180)	(3,250)	(857)
Prior service cost
Amortization to net income of net prior service credits	(61)	(26)	(61)
Prior service cost arising during period	(142)	(27)	(12)
Defined benefit plans sponsored by equity affiliates	(54)	(81)	(12)
Income taxes on defined benefit plans	143	1,030	140
Total	(374)	(1,581)	(167)
Other Comprehensive Loss, Net of Tax	(347)	(1,556)	(145)
Comprehensive Income	25,989	25,452	18,991
Comprehensive income attributable to noncontrolling interests	(157)	(113)	(112)
Comprehensive Income Attributable to Chevron Corporation	$ 25,832	$ 25,339	$ 18,879