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Financial Risk Management Activities - Derivative Contracts - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
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 135   135   163
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 (64) $ 143 (179) $ 435  
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) related to outstanding crude oil hedging contracts (88)   (88)    
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings within the next twelve months     (82)    
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) 0 0 1 (6)  
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 (1) (2) (4)  
Net gains (losses) on foreign exchange contracts not designated as hedging instruments $ 1 $ 1 $ 1 $ 4