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Acquisitions and Dispositions - Narrative (Details) $ in Billions			3 Months Ended
	Oct. 04, 2023 USD ($)	Oct. 04, 2023 CAD ($)	Mar. 31, 2024 USD ($)	Oct. 04, 2023 CAD ($)	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Surmont | Subsequent Event
Asset Acquisition [Line Items]
Percentage of interest acquired	50.00%			50.00%
Total Consideration	$ 3,000,000,000	$ 4.1
Business acquisition, maximum payment	$ 300,000,000			$ 0.4
Business acquisition, contingent payment term	5 years	5 years
Business acquisition, cost per every dollar exceeding threshold	$ 2,000,000
Business acquisition, threshold	52
Contingent consideration, outcome, low	$ 0
Contingent consideration, outcome, high	$ 300,000,000
NFS3
Asset Acquisition [Line Items]
Equity method investment, ownership percentage					25.00%		25.00%
North Field South | NFS3
Asset Acquisition [Line Items]
Ownership percentage					25.00%
PALNG
Asset Acquisition [Line Items]
Equity method investment, ownership percentage						30.00%
PALNG | Sempra
Asset Acquisition [Line Items]
Ownership percentage					70.00%
APLNG
Asset Acquisition [Line Items]
Equity method investment, ownership percentage					47.50%
APLNG | Forecast
Asset Acquisition [Line Items]
Equity method investment, ownership percentage			49.99%
Payments to acquire equity method investments			$ 500,000,000
Additional ownership percentage in equity investment acquired			2.49%

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