Share-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Compensation (Textual) [Abstract]
Pre-tax share-based compensation expense	$ 24	$ 21	$ 69	$ 65
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)			171	92
Weighted average share fair value (usd per share)			$ 402.13	$ 294.44
Unrestricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants (in shares)			4	6
Weighted average share fair value (usd per share)			$ 405.81	$ 297.10