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Fair Value - Changes in Level 3 Financial Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Net realized and unrealized capital gains (losses):    
Change in unrealized capital losses included in OCI associated with Level 3 financial assets $ 9 $ 4
Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 111 84
Net realized and unrealized capital gains (losses):    
Included in earnings (9) 5
Included in other comprehensive income (loss) (9) (4)
Purchases 95 17
Sales (30) (5)
Settlements 0 (1)
Transfers into (out of) Level 3, net (29) 15
Ending balance 129 111
States, municipalities and political subdivisions | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 5 1
Net realized and unrealized capital gains (losses):    
Included in earnings 0 0
Included in other comprehensive income (loss) 0 0
Purchases 0 0
Sales (5) (1)
Settlements 0 0
Transfers into (out of) Level 3, net 0 5
Ending balance 0 5
U.S. corporate securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 38 52
Net realized and unrealized capital gains (losses):    
Included in earnings (8) (10)
Included in other comprehensive income (loss) (5) (3)
Purchases 36 1
Sales 0 (1)
Settlements 0 (1)
Transfers into (out of) Level 3, net 0 0
Ending balance 61 38
Foreign securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 10 0
Net realized and unrealized capital gains (losses):    
Included in earnings 0 0
Included in other comprehensive income (loss) (2) 0
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into (out of) Level 3, net 0 10
Ending balance 8 10
Other asset-backed securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 3 0
Net realized and unrealized capital gains (losses):    
Included in earnings 0 0
Included in other comprehensive income (loss) (2) 0
Purchases 30 3
Sales (2) 0
Settlements 0 0
Transfers into (out of) Level 3, net (29) 0
Ending balance 0 3
Redeemable preferred securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0 1
Net realized and unrealized capital gains (losses):    
Included in earnings   2
Included in other comprehensive income (loss)   (1)
Purchases   0
Sales   (2)
Settlements   0
Transfers into (out of) Level 3, net   0
Ending balance   0
Equity securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 55 30
Net realized and unrealized capital gains (losses):    
Included in earnings (1) 13
Included in other comprehensive income (loss) 0 0
Purchases 29 13
Sales (23) (1)
Settlements 0 0
Transfers into (out of) Level 3, net 0 0
Ending balance $ 60 $ 55