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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Contract liabilities	$ 133	$ 128	$ 164
Revenue recognized	118	$ 117
Midstream & Marketing
Disaggregation of Revenue [Line Items]
Expected revenue	2,200
Utilities
Disaggregation of Revenue [Line Items]
Expected revenue	$ 200