Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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Number Of Aboveground Storage Tanks

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COMMITMENTS AND CONTINGENCIES - Additional Information (Detail) $ in Millions		1 Months Ended	12 Months Ended
	Jul. 05, 2018 USD ($)	Nov. 30, 2019 tank	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Unconditional purchase obligations, change of amount				$ 63
Number of aboveground storage tanks \| tank		4
Environmental remediation costs recorded				3
Environmental remediation expense				1
Environmental remediation costs, included in Balance Sheet				2
Settlement Agreement
Commitments and Contingencies Disclosure [Line Items]
Litigation settlement, amount awarded from other party				$ 42
Settlement Agreement \| Maximum
Commitments and Contingencies Disclosure [Line Items]
Litigation settlement, amount awarded from other party	$ 42
Forecast
Commitments and Contingencies Disclosure [Line Items]
Environmental remediation expense			$ 2