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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net Income (Loss) $ (5,561) $ 2,845 $ 14,860
Currency translation adjustment      
Unrealized net change arising during period 35 (18) (19)
Unrealized holding gain (loss) on securities      
Net gain (loss) arising during period (2) 2 (5)
Derivatives      
Net derivatives loss on hedge transactions 0 (1) 0
Income taxes on derivatives transactions 0 3 0
Total 0 2 0
Actuarial gain (loss)      
Amortization to net income of net actuarial loss and settlements 1,107 519 792
Actuarial gain (loss) arising during period (2,004) (2,404) 85
Prior service credits (cost)      
Amortization to net income of net prior service costs and curtailments (23) 4 (13)
Prior service (costs) credits arising during period 0 (28) (26)
Defined benefit plans sponsored by equity affiliates - benefit (cost) (104) (33) 23
Income tax benefit (cost) on defined benefit plans 369 510 (230)
Total (655) (1,432) 631
Other Comprehensive Gain (Loss), Net of Tax (622) (1,446) 607
Comprehensive Income (6,183) 1,399 15,467
Comprehensive loss (income) attributable to noncontrolling interests 18 79 (36)
Comprehensive Income (Loss) Attributable to Chevron Corporation $ (6,165) $ 1,478 $ 15,431