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INSURANCE GROUP STATUTORY FINANCIAL INFORMATION - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) prescribedAndPermittedPractice | Dec. 31, 2022 USD ($) prescribedAndPermittedPractice | Sep. 30, 2022 | Sep. 30, 2021 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Number of prescribed and permitted practices | prescribedAndPermittedPractice | 3 | 3 |  |
Statement of Statutory Accounting Principles 108 |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Statutory accounting practices, statutory surplus, increase | $ 86,000,000 | $ 86,000,000 |  |
Statutory accounting practices, statutory net income, decrease | $ 1,300,000,000 | $ 1,400,000,000 |  |
Statutory accounting practices, hedging losses amortization period |  | 5 years |  |
Statutory accounting practices, statutory unassigned surplus, balance |  |  |  | $ 0
Regulation Number 213 |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Statutory accounting practices, statutory surplus, increase (decrease) to new standard application |  | $ (1,900,000,000) |  |
Statutory accounting practices, total asset required, percentage |  |  | 100.00% |
Statutory accounting practices, statutory net income, increase (decrease) to new standard application |  | (700,000,000) |  |
Regulation Number 213 with Seperate Accounts |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Statutory accounting practices, statutory surplus, increase (decrease) to new standard application |  | 2,200,000,000 |  |
Statutory accounting practices, statutory net income, increase (decrease) to new standard application |  | $ 2,300,000,000 |  |

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