Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Contract liabilities	$ 100	$ 93	$ 149
Revenue recognized	112	$ 131
Midstream & Marketing
Disaggregation of Revenue [Line Items]
Expected revenue	2,300
Utilities
Disaggregation of Revenue [Line Items]
Expected revenue	$ 200