Shareholders' Equity - Narrative (Details) - Capital Allocation Plan $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	May 11, 2026 USD ($) shares	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 USD ($) repurchaseAgreement shares	Sep. 30, 2025 USD ($)
Equity, Class of Treasury Stock [Line Items]
Increase in stock authorized for repurchase		$ 4,400
Common stock repurchased (in shares) \| shares		0	0
Share repurchase			$ 150	$ 150
Number of share repurchase agreements \| repurchaseAgreement			2
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining repurchase amount	$ 4,700
Common stock repurchased (in shares) \| shares	1,200,000
Share repurchase	$ 338

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details