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INVESTMENTS - Mortgage Loans (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Allowance for credit losses on mortgage loans:    
Balance, beginning of period $ 278  
Balance, end of period 272 $ 297
Commercial mortgages:    
Allowance for credit losses on mortgage loans:    
Balance, beginning of period 259 272
Current-period provision for expected credit losses (5) 16
Write-offs charged against the allowance 0 0
Recoveries of amounts previously written off 0 0
Net change in allowance (5) 16
Balance, end of period 254 288
Agricultural mortgages:    
Allowance for credit losses on mortgage loans:    
Balance, beginning of period 15 6
Current-period provision for expected credit losses (2) 0
Write-offs charged against the allowance 0 0
Recoveries of amounts previously written off 0 0
Net change in allowance (2) 0
Balance, end of period 13 6
Residential mortgages:    
Allowance for credit losses on mortgage loans:    
Balance, beginning of period 4 1
Current-period provision for expected credit losses 1 2
Write-offs charged against the allowance 0 0
Recoveries of amounts previously written off 0 0
Net change in allowance 1 2
Balance, end of period $ 5 $ 3