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Financial Risk Management Activities - Derivative Contracts - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Unrealized change in fair value of interest rate swaps - increase (decrease) $ 4 $ 1  
Interest Rate Swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Outstanding gross notional amount 100   $ 100
Foreign Exchange Forwards / Swaps      
Derivative Instruments, Gain (Loss) [Line Items]      
Outstanding gross notional amount 156   145
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 (92) (51)  
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings within the next twelve months (433)    
Deferred losses in Accumulated other comprehensive income (loss) related to outstanding crude oil hedging contracts, net of tax (433)    
Derivative Contracts Designated as Hedging Instruments: | Interest Rate Swaps | Designated as Fair Value Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Outstanding gross notional amount 100   $ 100
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   (1)  
Net gains (losses) on foreign exchange contracts not designated as hedging instruments $ 4 $ (1)