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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Contract with customer, liability, revenue recognized	$ 1,800	$ 1,700
Revenue, remaining performance obligation, amount	22,700
Capitalized contract cost, amortization	$ 373	$ 312
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]: 2025-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	63.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	2 years

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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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