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Fair Value - Changes in Level 3 Financial Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Net realized and unrealized capital gains (losses):    
Change in unrealized capital losses included in OCI associated with Level 3 financial assets $ (4) $ (4)
Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 84 88
Net realized and unrealized capital gains (losses):    
Included in earnings  5 4
Included in other comprehensive income (4) (5)
Purchases 17 30
Sales (5) (33)
Settlements (1) (1)
Transfers into Level 3, net 15 1
Ending balance 111 84
States, municipalities and political subdivisions | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1 0
Net realized and unrealized capital gains (losses):    
Included in earnings  0 0
Included in other comprehensive income 0 0
Purchases 0 0
Sales (1) 0
Settlements 0 0
Transfers into Level 3, net 5 1
Ending balance 5 1
U.S. corporate securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 52 37
Net realized and unrealized capital gains (losses):    
Included in earnings  (10) (11)
Included in other comprehensive income (3) 0
Purchases 1 27
Sales (1) 0
Settlements (1) (1)
Transfers into Level 3, net 0 0
Ending balance 38 52
Foreign 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 0  
Purchases 0  
Sales 0  
Settlements 0  
Transfers into Level 3, net 10  
Ending balance 10 0
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 0  
Purchases 3  
Sales 0  
Settlements 0  
Transfers into Level 3, net 0  
Ending balance 3 0
Redeemable preferred securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 1 12
Net realized and unrealized capital gains (losses):    
Included in earnings  2 18
Included in other comprehensive income (1) (5)
Purchases 0 0
Sales (2) (24)
Settlements 0 0
Transfers into Level 3, net 0 0
Ending balance 0 1
Equity securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 30 39
Net realized and unrealized capital gains (losses):    
Included in earnings  13 (3)
Included in other comprehensive income 0 0
Purchases 13 3
Sales (1) (9)
Settlements 0 0
Transfers into Level 3, net 0 0
Ending balance $ 55 $ 30