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Financial Risk Management Activities - Fair Value Measurements - Additional Information (Detail) $ in Millions	Sep. 30, 2021 USD ($)
Fair Value Disclosures [Abstract]
Long-term debt	$ 8,507
Long-term debt, fair value	$ 10,052

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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