Summary of Reserve for Claim Losses - Summary of Reserve Claims (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Beginning balance	$ 1,509	$ 1,488
Change in reinsurance recoverable	(1)	(1)
Claim loss provision related to:
Current year	58	45
Prior years	0	0
Total title claim loss provision	58	45
Claims paid, net of recoupments related to:
Current year	0	(1)
Prior years	(48)	(48)
Total title claims paid, net of recoupments	(48)	(49)
Ending balance of claim loss reserve for title insurance	$ 1,518	$ 1,483
Provision for title insurance claim losses as a percentage of title insurance premiums	4.50%	4.50%