OTHER BALANCE SHEET AND STATEMENTS OF OPERATIONS INFORMATION - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
|
| Restructuring Cost and Reserve [Line Items] | |||||
| Gain on business divestitures | $ 181 | $ 0 | $ 181 | $ 0 | |
| MA Regulatory Solutions | Disposal Group, Disposed of by Sale, Not Discontinued Operations | |||||
| Restructuring Cost and Reserve [Line Items] | |||||
| Gain on business divestitures | 179 | ||||
| Disposal group, contingent consideration, maximum, amount | $ 119 | ||||
| MA Learning Solutions | Disposal Group, Disposed of by Sale, Not Discontinued Operations | |||||
| Restructuring Cost and Reserve [Line Items] | |||||
| Gain on business divestitures | $ 2 | $ 25 | |||