Summary of Reserve for Title Claim Losses (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Loss Contingencies [Line Items]
Change in reinsurance recoverable	$ (55)	$ 0
Title
Loss Contingencies [Line Items]
Beginning balance	1,509	1,488
Change in reinsurance recoverable	(1)	0
Claim loss provision related to:
Current year	119	107
Prior years	0	0
Total title claim loss provision	119	107
Claims paid, net of recoupments related to:
Current year	(2)	(2)
Prior years	(97)	(113)
Total title claims paid, net of recoupments	(99)	(115)
Ending balance of claim loss reserve for title insurance	$ 1,528	$ 1,480
Provision for title insurance claim losses as a percentage of title insurance premiums	4.50%	4.50%