Debt (U.S. Committed Credit Facilities) (Details) - Revolving credit agreement - USD ($)	Mar. 26, 2026	Mar. 31, 2024	Jun. 30, 2026	Sep. 30, 2025
364-Day Agreement | Line of Credit
Debt Instrument [Line Items]
Credit facility, amount borrowed and outstanding				$ 0
364-Day Agreement | Line of Credit
Debt Instrument [Line Items]
Debt instrument term	364 days
Maximum borrowing capacity	$ 500,000,000
Credit facility, amount borrowed and outstanding			$ 0
Credit Agreement 2024 | Line of Credit
Debt Instrument [Line Items]
Debt instrument term		5 years
Maximum borrowing capacity		$ 3,000,000,000.0
Credit Agreement 2024 | Line of Credit
Debt Instrument [Line Items]
Credit facility, amount borrowed and outstanding			$ 0	$ 0