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Debt - Additional Information (Details) - USD ($)		1 Months Ended	6 Months Ended
Debt - Additional Information (Details) - USD ($)	Feb. 27, 2026	Apr. 30, 2026	Mar. 31, 2026	Mar. 31, 2025
Commercial Paper
Debt Instrument [Line Items]
Debt instrument term (in years)			397 days
Debt instrument, maximum borrowing capacity			$ 3,000,000,000.0
Commercial paper, amount outstanding			0	$ 0
Commercial Paper \| Subsequent Event
Debt Instrument [Line Items]
Proceeds from (repayments of) commercial paper		$ 500,000,000
Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 3,000,000,000.0
Proceeds from senior debt	$ 3,000,000,000.0
Senior Notes \| December 2025 Notes
Debt Instrument [Line Items]
Repayments of senior debt			$ 4,000,000,000.0
Senior Notes \| Minimum
Debt Instrument [Line Items]
Debt instrument term (in years)	3 years
Stated interest rate (percent)	3.80%
Senior Notes \| Maximum
Debt Instrument [Line Items]
Debt instrument term (in years)	10 years
Stated interest rate (percent)	4.70%