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Revenue Recognition - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Contract with customer, liability, revenue recognized	$ 1,700,000,000	$ 1,500,000,000
Revenue, remaining performance obligation, amount	21,100,000,000
Capitalized contract cost, amortization	312,000,000	251,000,000
Capitalized contract cost, impairment loss	$ 0	$ 0
Minimum
Disaggregation of Revenue [Line Items]
Term duration	25 years
Maximum
Disaggregation of Revenue [Line Items]
Term duration	35 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	64.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	2 years

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