v3.26.1
Fair Value - Separate Accounts Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Other Assets    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets $ 77  
Total    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 1,902 $ 1,994
Cash and cash equivalents    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 155 156
Debt securities:    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 373 393
Common/collective trusts    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 1,374 1,445
Level 1 | Total    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 19 31
Level 1 | Cash and cash equivalents    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 1 1
Level 1 | Debt securities:    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 18 30
Level 1 | Common/collective trusts    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 0 0
Level 2 | Total    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 1,881 1,961
Level 2 | Cash and cash equivalents    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 154 155
Level 2 | Debt securities:    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 353 361
Level 2 | Common/collective trusts    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 1,374 1,445
Level 3 | Total    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 2 2
Level 3 | Cash and cash equivalents    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 0 0
Level 3 | Debt securities:    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets 2 2
Level 3 | Common/collective trusts    
Fair Value, Separate Account Investment [Line Items]    
Separate accounts assets $ 0 $ 0