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+ Details

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)