Increase (decrease) exploration, production, sales and other operating revenue.

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- Definition

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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No definition available.

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- Definition

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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- Definition

Nominal or face amount used to calculate payment on derivative.

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- Definition

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 - Derivative Contracts - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 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		$ 100,000,000
Foreign exchange forwards
Derivative Instruments, Gain (Loss) [Line Items]
Outstanding gross notional amount	74,000,000		74,000,000		90,000,000
Derivative Contracts Designated as Hedging Instruments: \| Commodity derivative contracts
Derivative Instruments, Gain (Loss) [Line Items]
Increased (decreased) sales and other operating revenue	228,000,000	$ (14,000,000)	292,000,000	$ 1,000,000
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings during the remainder of 2020			386,000,000
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)	1,000,000	(2,000,000)	6,000,000	(3,000,000)
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	(2,000,000)	(2,000,000)	(3,000,000)	3,000,000
Net gains (losses) on foreign exchange contracts not designated as hedging instruments	$ 1,000,000	$ 1,000,000	$ 3,000,000	$ 1,000,000