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Revenue - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Net revenue | $ 10,172 | $ 8,900 | $ 29,276 | $ 26,309
Revenue, remaining performance obligation, amount | 4,700 |  | 4,700 |
Value-Added Services |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Net revenue | $ 2,800 | $ 2,200 | $ 7,800 | $ 6,400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-01 |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Revenue, remaining performance obligation (in percent) | 50.00% |  | 50.00% |
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years) | 2 years |  | 2 years |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01 |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |
Revenue, remaining performance obligation (in percent) | 50.00% |  | 50.00% |
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years) |  |  |  |

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