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Financial Risk Management Activities - Derivative Contracts - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Interest Rate Swaps          
Derivative Instruments, Gain (Loss) [Line Items]          
Outstanding gross notional amount $ 100,000,000   $ 100,000,000   $ 100,000,000
Foreign Exchange Forwards          
Derivative Instruments, Gain (Loss) [Line Items]          
Outstanding gross notional amount 130,000,000   130,000,000   90,000,000
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 143,000,000 $ 2,000,000 435,000,000 $ 3,000,000  
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings within the next 12 months     199,000,000    
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   $ 100,000,000
Unrealized change in fair value of interest rate swaps - (increase in derivative asset) decrease in derivative liability 0 1,000,000 (6,000,000) 4,000,000  
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 (4,000,000) 4,000,000  
Net gains (losses) on foreign exchange contracts not designated as hedging instruments $ 1,000,000 $ 1,000,000 $ 4,000,000 $ 2,000,000