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FAIR VALUE - Financial Assets Measured on Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | $ 13,332 | $ 13,497
Common stock | 85 | 475
U.S. Treasury and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 525 | 602
Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 2,940 | 3,229
Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 743 | 841
Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 439 | 367
Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 1,473 | 1,410
Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 1,714 | 1,348
Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 5,498 | 5,700
Recurring Basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 4,730 | 3,322
Debt securities: | 13,332 | 13,497
Common stock | 85 | 475
Total invested assets | 18,147 | 17,294
Recurring Basis | U.S. Treasury and agency obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 525 | 602
Recurring Basis | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 2,940 | 3,229
Recurring Basis | Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 743 | 841
Recurring Basis | Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 439 | 367
Recurring Basis | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 1,473 | 1,410
Recurring Basis | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 1,714 | 1,348
Recurring Basis | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 5,498 | 5,700
Recurring Basis | Quoted Prices in Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 4,730 | 3,322
Debt securities: | 0 | 0
Common stock | 85 | 475
Total invested assets | 4,815 | 3,797
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] |  |
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] |  |
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] |  |
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] |  |
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] |  |
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] |  |
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] |  |
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
Debt securities: | 13,230 | 13,429
Common stock | 0 | 0
Total invested assets | 13,230 | 13,429
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] |  |
Debt securities: | 525 | 602
Recurring Basis | Other Observable Inputs (Level 2) | Mortgage-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 2,940 | 3,229
Recurring Basis | Other Observable Inputs (Level 2) | Tax-exempt municipal securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 743 | 841
Recurring Basis | Other Observable Inputs (Level 2) | Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 439 | 367
Recurring Basis | Other Observable Inputs (Level 2) | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 1,473 | 1,410
Recurring Basis | Other Observable Inputs (Level 2) | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 1,714 | 1,348
Recurring Basis | Other Observable Inputs (Level 2) | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 5,396 | 5,632
Recurring Basis | Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Debt securities: | 102 | 68
Common stock | 0 | 0
Total invested assets | 102 | 68
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] |  |
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] |  |
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] |  |
Debt securities: | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Residential |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Asset-backed securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | 0 | 0
Recurring Basis | Unobservable Inputs (Level 3) | Corporate debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities: | $ 102 | $ 68

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