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v3.26.1

Revenue - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025 | Sep. 30, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Net revenue | $ 11,230 | $ 9,594 | $ 22,131 | $ 19,104 |
Deferred revenue | 1,900 |  | 1,900 |  | $ 1,700
Value-Added Services |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |
Net revenue | 3,300 | $ 2,600 | 6,500 | $ 5,000 |
Revenue, remaining performance obligation, amount | $ 5,500 |  | $ 5,500 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01 |  |  |  |  |
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]: 2028-04-01 |  |  |  |  |
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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