Financial Risk Management Activities - Corporate Financial Risk Management Activities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	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
Unrealized change in fair value of interest rate swaps - (increase in derivative asset) decrease in derivative liability	5,000,000	$ (1,000,000)
Foreign Exchange
Derivative Instruments Gain Loss [Line Items]
Outstanding gross notional amount	65,000,000		$ 90,000,000
Foreign exchange gains (losses) reported in Other, net in the Statement of Consolidated Income	(1,000,000)	5,000,000
Net gains (losses) on foreign exchange contracts not designated as hedging instruments	2,000,000	(1,000,000)
Derivative Contracts Designated as Hedging Instruments | Crude Oil
Derivative Instruments Gain Loss [Line Items]
Increased (decreased) sales and other operating revenue	64,000,000	$ 15,000,000
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings during the remainder of 2020	$ 831,000,000