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Goodwill (Carrying Amount of Goodwill by Reportable Segment) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]      
Goodwill, Gross Beginning Balance $ 1,413 $ 1,151  
Accumulated impairment losses Beginning Balance (34) 0  
Goodwill, Beginning Balance 1,379 1,151  
Acquisitions 209 261  
Dispositions   (1)  
Impairment losses   (34)  
Foreign currency translation   2  
Goodwill, Gross Ending Balance 1,622 1,413 $ 1,151
Accumulated impairment losses Ending Balance (34) (34) 0
Goodwill, Ending Balance 1,588 1,379 1,151
Title Insurance and Services      
Goodwill [Line Items]      
Goodwill, Gross Beginning Balance 1,366 1,104  
Accumulated impairment losses Beginning Balance 0 0  
Goodwill, Beginning Balance 1,366 1,104  
Acquisitions 209 261  
Dispositions   (1)  
Impairment losses 0 0 0
Foreign currency translation   2  
Goodwill, Gross Ending Balance 1,575 1,366 1,104
Accumulated impairment losses Ending Balance 0 0 0
Goodwill, Ending Balance 1,575 1,366 1,104
Specialty Insurance      
Goodwill [Line Items]      
Goodwill, Gross Beginning Balance 47 47  
Accumulated impairment losses Beginning Balance (34) 0  
Goodwill, Beginning Balance 13 47  
Acquisitions 0 0  
Dispositions   0  
Impairment losses   (34)  
Foreign currency translation   0  
Goodwill, Gross Ending Balance 47 47 47
Accumulated impairment losses Ending Balance (34) (34) 0
Goodwill, Ending Balance $ 13 $ 13 $ 47