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Business, Basis of Presentation and Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Accounting Policies [Line Items]      
Number of operating segments | segment 3    
Number of reportable segments | segment 3    
Net gains (losses) $ (130,000,000) $ (27,000,000) $ (72,000,000)
Goodwill 804,000,000 748,000,000 748,000,000
Payments for business acquisitions, net of cash acquired (224,000,000) 0 584,000,000
Contract cost assets 109,000,000 105,000,000  
Amortization expense 23,000,000 $ 21,000,000 $ 20,000,000
Impairment loss for contract costs capitalized $ 0    
Rate required of collateral as a percent of market value of loans securities 102.00%    
OneAmerica      
Accounting Policies [Line Items]      
Payments to acquire businesses $ 50,000,000    
Minimum      
Accounting Policies [Line Items]      
Weighted Average Amortization Lives (Years) 5 years    
Minimum | Software subscriptions and services      
Accounting Policies [Line Items]      
Revenue from contract with customer, contract term 1 year    
Maximum      
Accounting Policies [Line Items]      
Weighted Average Amortization Lives (Years) 15 years    
Maximum | Software subscriptions and services      
Accounting Policies [Line Items]      
Revenue from contract with customer, contract term 3 years    
Commercial Portfolio Segment      
Accounting Policies [Line Items]      
Threshold period past due 60 days    
Threshold period past due, nonaccrual 90 days    
Customer relationship lists(2)      
Accounting Policies [Line Items]      
Weighted Average Amortization Lives (Years) 16 years    
Computer software(3)      
Accounting Policies [Line Items]      
Weighted Average Amortization Lives (Years) 5 years    
OneAmerica      
Accounting Policies [Line Items]      
Other payments to acquire businesses $ 160,000,000    
VIM Holdings      
Accounting Policies [Line Items]      
Subsidiary, ownership percentage, noncontrolling owner 24.00%