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Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Insurance [Abstract]        
Known title claims, amount $ 65 $ 67    
Incurred but not reported claims, amount 1,178 1,143    
Total title claims, amount 1,243 1,210    
Non-title claims, amount 65 74    
Total loss reserves, amount $ 1,308 $ 1,284 $ 1,243 $ 1,178
Known title claims, percent 5.00% 5.20%    
Incurred but not reported claims, percent 90.00% 89.00%    
Total title claims, percent 95.00% 94.20%    
Non-title claims, percent 5.00% 5.80%    
Total loss reserves, percent 100.00% 100.00%