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Revenue Recognition - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |  |
Contract with customer, liability, revenue recognized | $ 222,000,000 | $ 193,000,000 | $ 1,387,000,000 | $ 1,252,000,000
Capitalized contract cost, amortization | 66,000,000 | 48,000,000 | 188,000,000 | 145,000,000
Capitalized contract cost, impairment loss | 0 | $ 0 | $ 0 | $ 0
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]: 2023-07-01 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, remaining performance obligation, amount | $ 19,200,000,000 |  | $ 19,200,000,000 |
Revenue, remaining performance obligation, percentage | 65.00% |  | 65.00% |
Revenue, remaining performance obligation, expected timing of satisfaction, period | 2 years |  | 2 years |

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