Financial Risk Management Activities - Notional Amounts of Outstanding Financial Risk Management Derivative Contracts (Detail) MMBbls in Millions	Dec. 31, 2021 USD ($) MMBbls	Dec. 31, 2020 USD ($) MMBbls
Commodity Crude Oil Hedge Contracts
Derivative [Line Items]
Commodity - crude oil (millions of barrels) \| MMBbls	54.8	27.4
Foreign Exchange Forwards
Derivative [Line Items]
Outstanding gross notional amount \| $	$ 145,000,000	$ 163,000,000

Nominal number of units used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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