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INVESTMENTS - Mortgage Loans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Allowance for credit losses on mortgage loans:        
Balance, beginning of period     $ 278  
Balance, end of period $ 287 $ 261 287 $ 261
Commercial mortgages:        
Allowance for credit losses on mortgage loans:        
Balance, beginning of period 293 222 259 272
Current-period provision for expected credit losses (19) 22 15 47
Write-offs charged against the allowance 0 0 0 (75)
Recoveries of amounts previously written off 0 0 0 0
Net change in allowance (19) 22 15 (28)
Balance, end of period 274 244 274 244
Agricultural mortgages:        
Allowance for credit losses on mortgage loans:        
Balance, beginning of period 5 9 15 6
Current-period provision for expected credit losses 1 4 (1) 7
Write-offs charged against the allowance 0 0 (8) 0
Recoveries of amounts previously written off 0 0 0 0
Net change in allowance 1 4 (9) 7
Balance, end of period 6 13 6 13
Residential mortgages:        
Allowance for credit losses on mortgage loans:        
Balance, beginning of period 7 3 4 1
Current-period provision for expected credit losses 0 1 3 3
Write-offs charged against the allowance 0 0 0 0
Recoveries of amounts previously written off 0 0 0 0
Net change in allowance 0 1 3 3
Balance, end of period $ 7 $ 4 $ 7 $ 4