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Reserves for Future Policy Benefits and Contract Owner Account Balances (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
professional
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]        
Liability for Unpaid Claims and Claims Adjustment Expense, Net $ 456 $ 590 $ 385 $ 392
Current Year Claims and Claims Adjustment Expense 1,252 1,538 1,042  
Prior Year Claims and Claims Adjustment Expense 36 143 (8)  
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 1,288 1,681 1,034  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year (831) (964) (665)  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 591 512 376  
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (1,422) (1,476) (1,041)  
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments (2) (5) (16) (6)
Liability for Claims and Claims Adjustment Expense 458 595 401 $ 398
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 4,020      
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years 591 512 376  
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 456      
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net (3,564)      
Short-Duration Insurance Contract, Accident Year 2023        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,187 1,191 1,042  
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 5      
Short-Duration Insurance Contract, Cumulative Number of Reported Claims | professional 32,822,000,000      
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ (1,182) (1,177) $ (665)  
Short-Duration Insurance Contract, Accident Year 2024        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,581 1,538    
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 30      
Short-Duration Insurance Contract, Cumulative Number of Reported Claims | professional 42,102,000,000      
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ (1,551) $ (964)    
Short-Duration Insurance Contract, Accident Year 2025 [Member]        
Short-Duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Short-Duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,252      
Short-Duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 421      
Short-Duration Insurance Contract, Cumulative Number of Reported Claims | professional 19,315,000,000      
Short-Duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ (831)