v3.25.0.1
Fair Value - Changes in Level 3 Financial Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Net realized and unrealized capital gains (losses):    
Fair Value Recurring Basis, Unobservable Input Reconciliation Asset Gain (Loss), Statement Of Income, Extensible List, Not Disclosed Flag Included in earnings Included in earnings
Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 108 $ 129
Net realized and unrealized capital gains (losses):    
Included in earnings 23 (10)
Included in other comprehensive income (loss) (1) 1
Purchases 101 41
Sales 0 (3)
Gross transfers out of level 3 (67) (50)
Ending balance 164 108
Commercial mortgage-backed securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0 0
Net realized and unrealized capital gains (losses):    
Included in earnings 0 0
Included in other comprehensive income (loss) 0 0
Purchases 52 13
Sales 0 0
Gross transfers out of level 3 (52) (13)
Ending balance 0 0
U.S. corporate securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 29 61
Net realized and unrealized capital gains (losses):    
Included in earnings (5) (8)
Included in other comprehensive income (loss) (1) 1
Purchases 15 5
Sales 0 (1)
Gross transfers out of level 3 0 (29)
Ending balance 38 29
Other asset-backed securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0  
Net realized and unrealized capital gains (losses):    
Included in earnings 0  
Included in other comprehensive income (loss) 0  
Purchases 15  
Sales 0  
Gross transfers out of level 3 (15)  
Ending balance 0 0
Foreign securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0 8
Net realized and unrealized capital gains (losses):    
Included in earnings   0
Included in other comprehensive income (loss)   0
Purchases   0
Sales   0
Gross transfers out of level 3   (8)
Ending balance   0
Equity securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 79 60
Net realized and unrealized capital gains (losses):    
Included in earnings 28 (2)
Included in other comprehensive income (loss) 0 0
Purchases 19 23
Sales 0 (2)
Gross transfers out of level 3 0 0
Ending balance $ 126 $ 79