Financial Risk Management Activities - Derivative Contracts - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Contracts Designated as Hedging Instruments: | Commodity Options / Collars | Designated as Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Increase (decrease) in sales and other operating revenues due to hedging instruments	$ (52)	$ (165)	$ (138)	$ (420)
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings within the next twelve months			(49)
Deferred losses in Accumulated other comprehensive income (loss) related to outstanding crude oil hedging contracts, net of tax			(49)
Derivative Contracts Not Designated as Hedging Instruments: | Foreign Exchange Forwards / Swaps
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange gains (losses) reported in Other, net in the Statement of Consolidated Income	0	(2)	0	(5)
Net gains (losses) on foreign exchange contracts not designated as hedging instruments	$ 8	$ 12	$ 6	$ 26