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INVESTMENTS - Mortgage Loans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Allowance for credit losses on mortgage loans:      
Balance, beginning of period $ 279 $ 129  
Balance, end of period 278 279 $ 129
Commercial mortgages:      
Allowance for credit losses on mortgage loans:      
Balance, beginning of period 272 123 57
Current-period provision for expected credit losses 62 149 66
Write-offs charged against the allowance (75) 0 0
Recoveries of amounts previously written off 0 0 0
Net change in allowance (13) 149 66
Balance, end of period 259 272 123
Agricultural mortgages:      
Allowance for credit losses on mortgage loans:      
Balance, beginning of period 6 6 5
Current-period provision for expected credit losses 9 0 1
Write-offs charged against the allowance 0 0 0
Recoveries of amounts previously written off 0 0 0
Net change in allowance 9 0 1
Balance, end of period 15 6 6
Residential mortgages:      
Allowance for credit losses on mortgage loans:      
Balance, beginning of period 1 0 0
Current-period provision for expected credit losses 3 1 0
Write-offs charged against the allowance 0 0 0
Recoveries of amounts previously written off 0 0 0
Net change in allowance 3 1 0
Balance, end of period $ 4 $ 1 $ 0