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Financial Risk Management Activities - Derivative Contracts - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest Rate Swaps | Designated as Fair Value Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Outstanding gross notional amount $ 100,000,000 $ 100,000,000  
Foreign Exchange Forwards      
Derivative Instruments, Gain (Loss) [Line Items]      
Outstanding gross notional amount 145,000,000 163,000,000  
Derivative Contracts Designated as Hedging Instruments: | Commodity Crude Oil Hedge Contracts | Designated as Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Increase (decrease) in sales and other operating revenues due to hedging instruments (243,000,000) 547,000,000 $ 1,000,000
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings within the next twelve months 68,000,000    
Deferred income (losses) in Accumulated other comprehensive income (loss), net of tax to be reclassified into earnings within the next twelve months 68,000,000    
Derivative Contracts Designated as Hedging Instruments: | Interest Rate Swaps | Designated as Fair Value Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Outstanding gross notional amount 100,000,000 100,000,000  
Unrealized change in fair value of interest rate swaps - increase (decrease) (3,000,000) 4,000,000 3,000,000
Derivative Contracts Not Designated as Hedging Instruments: | Foreign Exchange Forwards      
Derivative Instruments, Gain (Loss) [Line Items]      
Foreign exchange gains (losses) reported in Other, net in the Statement of Consolidated Income (2,000,000) (6,000,000) 3,000,000
Net gains (losses) on foreign exchange contracts not designated as hedging instruments $ 1,000,000 $ 2,000,000 $ (2,000,000)