Summary of Reserve for Title Claim Losses (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Loss Contingencies [Line Items]
Change in reinsurance recoverable	$ (70)	$ 0
Title
Loss Contingencies [Line Items]
Beginning balance	1,509	1,488
Change in reinsurance recoverable	(1)	(1)
Claim loss provision related to:
Current year	196	174
Prior years	0	0
Total title claim loss provision	196	174
Claims paid, net of recoupments related to:
Current year	(4)	(5)
Prior years	(145)	(162)
Total title claims paid, net of recoupments	(149)	(167)
Ending balance of claim loss reserve for title insurance	$ 1,555	$ 1,494
Provision for title insurance claim losses as a percentage of title insurance premiums	4.50%	4.50%