Reserve for Known and Incurred but Not Reported Claims (Summary of Loss Reserves) (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Insurance [Abstract]
Known title claims, amount	$ 62	$ 67
IBNR title claims, amount	1,207	1,143
Total title claims, amount	1,269	1,210
Non-title claims, amount	56	74
Total loss reserves, amount	$ 1,325	$ 1,284	$ 1,178	$ 1,063
Known title claims, percent	4.70%	5.20%
IBNR title claims, percent	91.10%	89.00%
Total title claims, percent	95.80%	94.20%
Non-title claims, percent	4.20%	5.80%
Total loss reserves	100.00%	100.00%