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FAIR VALUE - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | $ 17,176 | $ 18,635
Securities lending invested collateral | 560 | 418
U.S. Treasury and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 2,675 | 3,227
Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 3,524 | 3,995
Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 439 | 526
Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 570 | 522
Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 1,149 | 1,206
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 1,022 | 1,403
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 7,797 | 7,756
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 5,264 | 2,048
Total debt securities | 17,176 | 18,635
Securities lending invested collateral | 560 | 418
Total invested assets | 23,000 | 21,101
Recurring Basis | U.S. Treasury and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 2,675 | 3,227
Recurring Basis | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 3,524 | 3,995
Recurring Basis | Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 439 | 526
Recurring Basis | Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 570 | 522
Recurring Basis | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 1,149 | 1,206
Recurring Basis | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 1,022 | 1,403
Recurring Basis | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 7,797 | 7,756
Recurring Basis | Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 5,264 | 2,048
Total debt securities | 0 | 0
Securities lending invested collateral | 560 | 418
Total invested assets | 5,824 | 2,466
Recurring Basis | Quoted Prices in Active Markets (Level 1) | U.S. Treasury and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Quoted Prices in Active Markets (Level 1) | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Quoted Prices in Active Markets (Level 1) | Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Quoted Prices in Active Markets (Level 1) | Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Quoted Prices in Active Markets (Level 1) | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Quoted Prices in Active Markets (Level 1) | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Quoted Prices in Active Markets (Level 1) | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Total debt securities | 16,766 | 18,313
Securities lending invested collateral | 0 | 0
Total invested assets | 16,766 | 18,313
Recurring Basis | Other Observable Inputs (Level 2) | U.S. Treasury and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 2,675 | 3,227
Recurring Basis | Other Observable Inputs (Level 2) | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 3,524 | 3,995
Recurring Basis | Other Observable Inputs (Level 2) | Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 439 | 526
Recurring Basis | Other Observable Inputs (Level 2) | Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 570 | 522
Recurring Basis | Other Observable Inputs (Level 2) | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 1,133 | 1,199
Recurring Basis | Other Observable Inputs (Level 2) | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 933 | 1,330
Recurring Basis | Other Observable Inputs (Level 2) | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 7,492 | 7,514
Recurring Basis | Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Total debt securities | 410 | 322
Securities lending invested collateral | 0 | 0
Total invested assets | 410 | 322
Recurring Basis | Unobservable Inputs (Level 3) | U.S. Treasury and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 16 | 7
Recurring Basis | Unobservable Inputs (Level 3) | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | 89 | 73
Recurring Basis | Unobservable Inputs (Level 3) | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total debt securities | $ 305 | $ 242

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