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+ Details

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)