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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025
Intangible Asset, Finite-Lived [Line Items]
Goodwill	$ 1,799			$ 1,799		$ 1,807
Amortization of intangibles	12	$ 12		35	$ 35
EMEA
Intangible Asset, Finite-Lived [Line Items]
Goodwill, impairment loss			$ 333		$ 333
Goodwill	$ 0		$ 0	$ 0		$ 0