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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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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-Publisher SEC
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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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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 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	2,000,000	$ (1,000,000)	3,000,000	$ (4,000,000)
Foreign Exchange
Derivative Instruments Gain Loss [Line Items]
Outstanding gross notional amount	44,000,000		44,000,000		$ 16,000,000
Foreign exchange gains (losses) reported in Other, net in Revenues and Non-Operating Income in the Statement of Consolidated Income	(2,000,000)	(5,000,000)	3,000,000	(1,000,000)
Gains (Losses) on foreign exchange contracts not designated as hedging instruments	1,000,000	(3,000,000)	1,000,000	(1,000,000)
Derivative Contracts Designated as Hedging Instruments \| Crude Oil
Derivative Instruments Gain Loss [Line Items]
Increased (decreased) sales and other operating revenue	$ (14,000,000)	(44,000,000)	1,000,000	(74,000,000)
Pre-tax deferred income (losses) in Accumulated other comprehensive income (loss) to be reclassified into earnings during the remainder of 2019			$ 17,000,000
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		$ (8,000,000)		$ (16,000,000)