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Investments (Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]      
Balance, beginning of year $ 203 $ 119 $ 235
Addition to (release of) allowance for expected losses 284 80 (98)
Write-down charged against allowance (29)    
Other 2 4 (3)
Reclassified to “Asset held-for-sale”     (15)
Total ending balance 460 203 119
Commercial Mortgage Loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance, beginning of year 188 111 218
Addition to (release of) allowance for expected losses 282 72 (92)
Write-down charged against allowance (29)    
Other 2 5 0
Reclassified to “Asset held-for-sale”     (15)
Total ending balance 443 188 111
Agricultural Property Loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance, beginning of year 13 4 9
Addition to (release of) allowance for expected losses 3 9 (5)
Write-down charged against allowance 0    
Other 0 0 0
Reclassified to “Asset held-for-sale”     0
Total ending balance 16 13 4
Residential property loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance, beginning of year 0 0 0
Addition to (release of) allowance for expected losses 0 0 0
Write-down charged against allowance 0    
Other 0 0 0
Reclassified to “Asset held-for-sale”     0
Total ending balance 0 0 0
Other collateralized loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance, beginning of year 0 0 3
Addition to (release of) allowance for expected losses 0 0 0
Write-down charged against allowance 0    
Other 0 0 (3)
Reclassified to “Asset held-for-sale”     0
Total ending balance 0 0 0
Uncollateralized loans      
Allowance for Loan and Lease Losses [Roll Forward]      
Balance, beginning of year 2 4 5
Addition to (release of) allowance for expected losses (1) (1) (1)
Write-down charged against allowance 0    
Other 0 (1) 0
Reclassified to “Asset held-for-sale”     0
Total ending balance $ 1 $ 2 $ 4