RESTRUCTURING COSTS - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| Restructuring Reserve [Roll Forward] | ||||
| Restructuring reserve, beginning balance | $ 87 | |||
| Expense | $ 30 | $ 19 | 113 | $ 29 |
| Utilized/Paid | 115 | |||
| Restructuring reserve, ending balance | 85 | 85 | ||
| Severance and benefits | ||||
| Restructuring Reserve [Roll Forward] | ||||
| Restructuring reserve, beginning balance | 85 | |||
| Expense | 95 | |||
| Utilized/Paid | 100 | |||
| Restructuring reserve, ending balance | 80 | 80 | ||
| Other | ||||
| Restructuring Reserve [Roll Forward] | ||||
| Restructuring reserve, beginning balance | 2 | |||
| Expense | 18 | |||
| Utilized/Paid | 15 | |||
| Restructuring reserve, ending balance | $ 5 | $ 5 | ||