v3.25.0.1
Fair Value - Separate Accounts Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets $ 3,311 $ 3,250  
Separate accounts liabilities 3,311 3,250 $ 3,228
Recurring      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 3,499 3,204  
Recurring | Other Payables      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts liabilities 188    
Recurring | Other Receivables      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets   46  
Recurring | Cash and cash equivalents      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 165 168  
Recurring | Debt securities      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 856 2,507  
Recurring | Common/collective trusts      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 2,478 529  
Recurring | Level 1      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 187 560  
Recurring | Level 1 | Cash and cash equivalents      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 1 2  
Recurring | Level 1 | Debt securities      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 186 558  
Recurring | Level 1 | Common/collective trusts      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 0 0  
Recurring | Level 2      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 3,311 2,644  
Recurring | Level 2 | Cash and cash equivalents      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 164 166  
Recurring | Level 2 | Debt securities      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 669 1,949  
Recurring | Level 2 | Common/collective trusts      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 2,478 529  
Recurring | Level 3      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 1 0  
Recurring | Level 3 | Cash and cash equivalents      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 0 0  
Recurring | Level 3 | Debt securities      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets 1 0  
Recurring | Level 3 | Common/collective trusts      
Fair Value, Separate Account Investment [Line Items]      
Separate accounts assets $ 0 $ 0