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Risk Management - Net Fair Value of Risk Management Positions (Parenthetical) (Detail) - Fair value derivative financial instruments [Member]	12 Months Ended
	Dec. 31, 2020
Bottom of Range [Member]
Disclosure of Derivative Financial Instruments [Line Items]
Average contract financial term	1 month
Top of Range [Member]
Disclosure of Derivative Financial Instruments [Line Items]
Average contract financial term	23 months

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Disclosure of derivative financial instruments.

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