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Financial Risk Management Activities - Derivative Contracts - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Interest Rate Swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Outstanding gross notional amount $ 100   $ 100   $ 100
Foreign Exchange Forwards / Swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Outstanding gross notional amount 153   153   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 165 $ 64 420 $ 179  
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings within the next twelve months     (155)    
Deferred losses in Accumulated other comprehensive income (loss) related to outstanding crude oil hedging contracts, net of tax     (155)    
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   $ 100
Unrealized change in fair value of interest rate swaps - increase (decrease) (1) 0 (6) (1)  
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 (2) 0 (5) (2)  
Net gains (losses) on foreign exchange contracts not designated as hedging instruments $ 12 $ 1 $ 26 $ 1