Increased decreased exploration, production, sales and other operating revenue.

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Realized gain (loss) on de-designated cash flow hedging instrument.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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Nominal or face amount used to calculate payment on derivative.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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Financial Risk Management Activities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
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) decrease in derivative liability	1,000,000		4,000,000	$ (4,000,000)
Interest Rate Swaps \| Maximum \| Designated as Fair Value Hedges
Derivative Instruments Gain Loss [Line Items]
Unrealized change in fair value of interest rate swaps - (increase) decrease in derivative liability		$ (1,000,000)
Foreign Exchange
Derivative Instruments Gain Loss [Line Items]
Outstanding gross notional amount	85,000,000		85,000,000		$ 16,000,000
Foreign exchange gains (losses) reported in Other, net in the Statement of Consolidated Income	1,000,000	(4,000,000)	4,000,000	(4,000,000)
Gains (Losses) on foreign exchange contracts not designated as hedging instruments	1,000,000		2,000,000	(1,000,000)
Foreign Exchange \| Maximum
Derivative Instruments Gain Loss [Line Items]
Gains (Losses) on foreign exchange contracts not designated as hedging instruments		(1,000,000)
Derivative Contracts Designated as Hedging Instruments \| Crude Oil
Derivative Instruments Gain Loss [Line Items]
Increased (decreased) sales and other operating revenue	$ 2,000,000	(45,000,000)	3,000,000	(119,000,000)
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings during the remainder of 2019			$ 27,000,000
Derivative Contracts Not Designated as Hedging Instruments \| Crude Oil
Derivative Instruments Gain Loss [Line Items]
Crude oil price hedging contracts decreased sales and other operating revenues by this amount, pre-tax		$ (4,000,000)		$ (20,000,000)