Summary of Reserve for Title Claim Losses - Narrative (Details) - Pending Litigation - USD ($) $ in Millions	Nov. 02, 2020	Oct. 23, 2020	Oct. 01, 2020	Sep. 03, 2020	Jul. 07, 2020	Jun. 29, 2020	May 29, 2020	Mar. 16, 2020	Mar. 06, 2020	Dec. 13, 2019	Oct. 22, 2019
Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., Chicago Title Co.
Loss Contingencies [Line Items]
Plaintiffs claim losses amount											$ 75
Ovation Fin. Holdings 2 LLC, Ovation Fund Mgmt. II, LLC, Banc of California, N.A. v. Chicago Title Ins. Co., and plaintiffs | Subsequent Event
Loss Contingencies [Line Items]
Plaintiffs claim losses amount			$ 100
Kim Funding, LLC, Kim H. Peterson, Joseph J. Cohen, and ABC Funding Strategies, LLC v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman
Loss Contingencies [Line Items]
Plaintiffs claim losses amount										$ 250
Wakefield Capital, LLC, Wakefield Investments, LLC, 2Budz Holding, LLC, Doug and Kristine Heidrich, and Jeff and Heidi Orr v. Chicago Title Co. and Chicago Title Ins. Co.
Loss Contingencies [Line Items]
Plaintiffs claim losses amount									$ 7
Randolph L. Levin, et al., v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, Betty Elixman, et al
Loss Contingencies [Line Items]
Plaintiffs claim losses amount								$ 38
Mark Atherton, et al., v. Chicago Title Co. and Chicago Title Ins. Co.
Loss Contingencies [Line Items]
Plaintiffs claim losses amount							$ 30
Susan Heller Fenley Separate Property Trust, Susan Heller Fenley Inherited Roth IRA, Shelley Lynn Tarditi Trust and ROJ, LLC v. Chicago Title Co., Chicago Title Ins. Co. et al
Loss Contingencies [Line Items]
Plaintiffs claim losses amount						$ 6
Yuan Yu and Polly Yu v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman
Loss Contingencies [Line Items]
Plaintiffs claim losses amount						$ 1
Banc of California, National Association v. Laurie Peterson
Loss Contingencies [Line Items]
Plaintiffs claim losses amount					$ 35
Laurie Peterson v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman
Loss Contingencies [Line Items]
Plaintiffs claim losses amount					$ 250
CalPrivate Bank v. Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992
Loss Contingencies [Line Items]
Plaintiffs claim losses amount				$ 13
Kim H. Peterson Trustee of the Peterson Family Trust dated April 14 1992 v. Chicago Title Co., Chicago Title Ins. Co., Thomas Schwiebert, Adelle Ducharme, and Betty Elixman
Loss Contingencies [Line Items]
Plaintiffs claim losses amount				$ 250
DH Claims LLC v. Chicago Title Co., Chicago Title Ins. Co., and Della Ducharme | Subsequent Event
Loss Contingencies [Line Items]
Plaintiffs claim losses amount		$ 2
CalPrivate Bank v. Chicago Title Co. and Chicago Title Ins. Co. | Subsequent Event
Loss Contingencies [Line Items]
Plaintiffs claim losses amount	$ 13