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INVESTMENTS - Mortgage Loans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance, beginning of year $ 129 $ 62  
Balance, end of year 279 129 $ 62
Commercial mortgages:      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance, beginning of year 123 57 77
Current-period provision for expected credit losses 149 66 (20)
Write-offs charged against the allowance 0 0 0
Recoveries of amounts previously written off 0 0 0
Net change in allowance 149 66 (20)
Balance, end of year 272 123 57
Agricultural mortgages:      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance, beginning of year 6 5 4
Current-period provision for expected credit losses 0 1 1
Write-offs charged against the allowance 0 0 0
Recoveries of amounts previously written off 0 0 0
Net change in allowance 0 1 1
Balance, end of year 6 6 5
Residential mortgages:      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Balance, beginning of year 0 0 0
Current-period provision for expected credit losses 1 0 0
Write-offs charged against the allowance 0 0 0
Recoveries of amounts previously written off 0 0 0
Net change in allowance 1 0 0
Balance, end of year $ 1 $ 0 $ 0