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Fair Value - Changes in Level 3 Financial Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net realized and unrealized capital gains (losses):    
Change in unrealized capital losses included in OCI associated with Level 3 financial assets $ (4)  
Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 88 $ 131
Net realized and unrealized capital gains (losses):    
Included in earnings  4 (20)
Included in other comprehensive income (5) 23
Purchases 30 18
Sales (33) (47)
Settlements (1) (13)
Transfers out of Level 3, net 1 (4)
Ending balance 84 88
States, municipalities and political subdivisions | 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 out of Level 3, net 1  
Ending balance 1 0
Foreign securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 0 3
Net realized and unrealized capital gains (losses):    
Included in earnings    0
Included in other comprehensive income   0
Purchases   2
Sales   0
Settlements   (1)
Transfers out of Level 3, net   (4)
Ending balance   0
U.S. corporate securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 37 67
Net realized and unrealized capital gains (losses):    
Included in earnings  (11) (33)
Included in other comprehensive income 0 18
Purchases 27 3
Sales 0 (6)
Settlements (1) (12)
Transfers out of Level 3, net 0 0
Ending balance 52 37
Equity securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 39 54
Net realized and unrealized capital gains (losses):    
Included in earnings  (3) 13
Included in other comprehensive income 0 0
Purchases 3 13
Sales (9) (41)
Settlements 0 0
Transfers out of Level 3, net 0 0
Ending balance 30 39
Redeemable preferred securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 12 7
Net realized and unrealized capital gains (losses):    
Included in earnings  18 0
Included in other comprehensive income (5) 5
Purchases 0 0
Sales (24) 0
Settlements 0 0
Transfers out of Level 3, net 0 0
Ending balance $ 1 $ 12