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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reserve For Known And Incurred But Not Reported Claims [Line Items]      
Payments, net of recoveries, related to: Current year $ 292 $ 268 $ 227
Payments, net of recoveries, related to: Prior years 190 203 $ 188
Payments on reinsured losses 4 21  
Reinsurance recoveries $ 3 $ 10  
Provision for title loss, percentage of title premiums and escrow fees 4.00% 5.00% 4.00%
Ultimate loss rate 4.00% 4.50% 4.00%
Estimated percentage increase in loss reserve for prior policy years   0.50%  
Estimated increase in loss reserve for prior policy years $ 0 $ 26 $ 0
Specialty Insurance      
Reserve For Known And Incurred But Not Reported Claims [Line Items]      
Payments, net of recoveries, related to: Current year 264 250 211
Payments, net of recoveries, related to: Prior years $ 64 $ 57 $ 42