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Stockholders' Deficit - Schedule of Share Repurchase Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended				6 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025	Jul. 31, 2025
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs
Beginning balance			$ 7,469		$ 6,615	$ 7,469	$ 6,615	$ 6,615
July 2024 Board Authorization									$ 4,000
Ending balance	$ 8,560	$ 6,070		$ 8,560		6,070	8,560	7,469
Excise taxes						10		$ 26
Open Market Transactions
Accelerated Share Repurchases [Line Items]
Total Number of Shares Purchased (in shares)		1.2	0.8	2.9	1.0
Average Price Paid Per Share (in dollars per share)		$ 693.25	$ 709.84	$ 533.46	$ 548.20
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs
Shares repurchased		$ (809)	$ (590)	$ (1,528)	$ (527)
Total dollar value, accrued		809	$ 590	1,528	$ 527
Open Market Transactions | Other Accrued Liabilities
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs
Shares repurchased	(22)
Total dollar value, accrued	$ 22
Share Repurchase Transactions
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs
Excise taxes		$ 8		$ 15		$ 10	$ 16

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Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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