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Revenue - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Net revenue	$ 10,901	$ 9,510
Deferred revenue	1,900		$ 1,700
Value-Added Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Net revenue	3,200	$ 2,400
Revenue, remaining performance obligation, amount	$ 5,400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation (in percent)	50.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years)	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation (in percent)	50.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period (in years)

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