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Investments - Investments - ACL on Mortgages (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]            
Number of loans held-for-sale 0   0   0 0
us-gaap_FinancingReceivableModificationsNumberOfContracts2 0 1 0 1    
Commercial Loan [Member]            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Beginning balance $ (43) $ (48) $ (44) $ (51) $ (44)  
Current period provision 6 0 6 (3)    
Financing Receivable, Allowance for Credit Loss, Writeoff $ 0 $ (4) $ (1) $ (4)    
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage   1.00%   1.00% 1.00%  
Commercial Loan [Member] | Extended Maturity            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing Receivable, Modified in Period, Amount   $ 9   $ 9