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Summary of Reserve for Title Claim Losses (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Loss Contingencies [Line Items]    
Change in insurance recoverable $ (79) $ (70)
Title    
Loss Contingencies [Line Items]    
Beginning balance 1,623 1,509
Change in insurance recoverable (10) (1)
Claim loss provision related to:    
Current year 278 196
Prior years 0 0
Total title claim loss provision 278 196
Claims paid, net of recoupments related to:    
Current year (6) (4)
Prior years (151) (145)
Total title claims paid, net of recoupments (157) (149)
Ending balance of claim loss reserve for title insurance $ 1,734 $ 1,555
Provision for title insurance claim losses as a percentage of title insurance premiums 4.50% 4.50%