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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net Income (Loss) $ 2,845 $ 14,860 $ 9,269
Currency translation adjustment      
Unrealized net change arising during period (18) (19) 57
Unrealized holding gain (loss) on securities      
Net gain (loss) arising during period 2 (5) (3)
Derivatives      
Net derivatives loss on hedge transactions (1) 0 0
Reclassification to net income of net realized gain 0 0 0
Income taxes on derivatives transactions 3 0 0
Total 2 0 0
Actuarial gain (loss)      
Amortization to net income of net actuarial loss and settlements 519 792 817
Actuarial gain (loss) arising during period (2,404) 85 (571)
Prior service credits (cost)      
Amortization to net income of net prior service costs and curtailments 4 (13) (20)
Prior service (costs) credits arising during period (28) (26) (1)
Defined benefit plans sponsored by equity affiliates - benefit (cost) (33) 23 19
Income (taxes) benefit on defined benefit plans 510 (230) (44)
Total (1,432) 631 200
Other Comprehensive Gain (Loss), Net of Tax (1,446) 607 254
Comprehensive Income 1,399 15,467 9,523
Comprehensive loss (income) attributable to noncontrolling interests 79 (36) (74)
Comprehensive Income (Loss) Attributable to Chevron Corporation $ 1,478 $ 15,431 $ 9,449