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Related Party Transactions - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2021
Related Party Transaction [Line Items]            
Total investments $ 89,728   $ 89,728   $ 80,755  
Cash and cash equivalents $ 11,568   $ 11,568   11,330  
AEILIC | Freestone Re Ltd. (Freestone)            
Related Party Transaction [Line Items]            
Reinsurance agreement, quota share, fixed indexed and payout annuities, percentage     50.00%      
Reinsurance agreement, quota share, fixed rate and fixed indexed annuities, percentage     70.00%      
American National Insurance Company (ANICO) | Freestone Re Ltd. (Freestone)            
Related Party Transaction [Line Items]            
Reinsurance agreement, ceded risk, in-force and future flow business           80.00%
Reinsurance agreement, ceded risk, in-force and future flow single premium immediate annuity business           70.00%
Reinsurance agreement, ceded risk, fixed deferred and equity-Indexed annuity business, issued           100.00%
Reinsurance agreement, ceded risk, fixed deferred and equity-indexed annuity business 70.00%   70.00%      
Related Party            
Related Party Transaction [Line Items]            
Payments to acquire investments     $ 3,100 $ 2,600    
Total investments $ 11,300   $ 11,300   9,600  
Related Party | North End Re            
Related Party Transaction [Line Items]            
Reinsurance, modified coinsurance basis 70.00%   70.00%      
Reinsurance, coinsurance basis 30.00%   30.00%      
Related Party | Brookfield Treasury Management Inc            
Related Party Transaction [Line Items]            
Cash and cash equivalents $ 262   $ 262   254  
Interest income 3 $ 6 9 8    
Related Party | Investment Management Fees            
Related Party Transaction [Line Items]            
Related party agreements and transactions 56 $ 40 155 $ 85    
Related Party | ANAT and BAMR US Holdings LLC Deposit Agreement            
Related Party Transaction [Line Items]            
Cash and cash equivalents $ 646   $ 646   $ 464