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FAIR VALUE - Schedule of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities $ 18,099 $ 18,635
Securities lending invested collateral 467  
U.S. Treasury and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 3,058 3,227
Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 4,017 3,995
Tax-exempt municipal securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 464 526
Residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 536 522
Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 1,053 1,206
Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 1,261 1,403
Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 7,710 7,756
Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 3,855 2,048
Total debt securities 18,099 18,635
Securities lending invested collateral 467 418
Total invested assets 22,421 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 3,058 3,227
Recurring Basis | Mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 4,017 3,995
Recurring Basis | Tax-exempt municipal securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 464 526
Recurring Basis | Residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 536 522
Recurring Basis | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 1,053 1,206
Recurring Basis | Asset-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 1,261 1,403
Recurring Basis | Corporate debt securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 7,710 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 3,855 2,048
Total debt securities 0 0
Securities lending invested collateral 467 418
Total invested assets 4,322 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 17,705 18,313
Securities lending invested collateral 0 0
Total invested assets 17,705 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 3,058 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 4,017 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 464 526
Recurring Basis | Other Observable Inputs (Level 2) | Residential    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 536 522
Recurring Basis | Other Observable Inputs (Level 2) | Commercial    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities 1,037 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 1,173 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 7,420 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 394 322
Securities lending invested collateral 0 0
Total invested assets 394 322
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 88 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 $ 290 $ 242