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Financial Risk Management Activities - Derivative Contracts - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Interest Rate Swaps      
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 121,000,000   163,000,000
Derivative Contracts Designated as Hedging Instruments: | Commodity Derivative Contracts | Designated as Cash Flow Hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Increase (decrease) in sales and other operating revenues due to hedging instruments (51,000,000) $ 64,000,000  
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings within the next 12 months (47,000,000)    
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 in derivative asset) decrease in derivative liability (1,000,000) 5,000,000  
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 (1,000,000) (1,000,000)  
Net gains (losses) on foreign exchange contracts not designated as hedging instruments $ (1,000,000) $ 2,000,000