Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Details) $ in Millions |
9 Months Ended |
|---|---|
|
Jun. 30, 2026
USD ($)
| |
| Income Tax Disclosure [Abstract] | |
| Balance at beginning of period | $ 65 |
| Decreases related to positions taken on items from prior years | (1) |
| Increases related to positions taken in the current year | 2 |
| Increases related to positions taken in the prior year | 1 |
| Lapse of statute of limitations | (1) |
| Balance at end of period | $ 66 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|