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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Other Income (Expense), Net
External services	$ 5	$ 4	$ 14	$ 8
Interest income	11	10	21	20
Gains (losses) on investments	0	5	(2)	14
Other income (expense), net	12	18	29	41
Miscellaneous	$ (4)	$ (1)	$ (4)	$ (1)

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