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Share-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Share-Based Compensation (Textual) [Abstract]
Pre-tax share-based compensation expense	$ 24	$ 21	$ 45	$ 44
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			201	190
Weighted average share fair value (usd per share)			$ 117.15	$ 93.48
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			51	58
Weighted average share fair value (usd per share)			$ 591.67	$ 387.72
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			165	89
Weighted average share fair value (usd per share)			$ 400.12	$ 295.84
Unrestricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			3	6
Weighted average share fair value (usd per share)			$ 402.22	$ 297.10