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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Contract with customer, liability, revenue recognized | $ 279 | $ 267 | $ 1,550 | $ 1,475
Revenue, remaining performance obligation, amount | 22,400 |  | 22,400 |
Capitalized contract cost, amortization | $ 104 | $ 84 | $ 279 | $ 218
Minimum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract term |  |  | 25 years |
Maximum |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contract term |  |  | 35 years |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, remaining performance obligation, percentage | 63.00% |  | 63.00% |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 2 years |  | 2 years |

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