CREDIT RISK - Schedule of Changes in the Allowance for Credit Losses (Details) - USD ($) $ in Millions |
3 Months Ended | 4 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Allowance for Credit Losses | ||||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | ||||
| Allowance, beginning of period | $ 140 | $ 12 | $ 140 | $ 12 |
| Current period provision for expected credit losses | 28 | 6 | 39 | 8 |
| Write-offs charged against allowance | (33) | (4) | (44) | (6) |
| Recoveries collected | 1 | 0 | 1 | 0 |
| Allowance, end of period | 136 | 14 | 136 | 14 |
| Allowance for Revenue Adjustments | ||||
| SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] | ||||
| Allowance, beginning of period | 65 | 2 | 64 | 2 |
| Current period provision for expected credit losses | 60 | 4 | 79 | 4 |
| Write-offs charged against allowance | (65) | (2) | (83) | (2) |
| Allowance, end of period | $ 60 | $ 4 | $ 60 | $ 4 |