Net Income Attributable to FNF Common Shareholders and Change in Total Equity (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 29, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Net earnings attributable to FNF common shareholders		$ 378	$ 250	$ 626	$ 722
Increase in additional paid-in-capital and decrease in non controlling interest from increase in ownership percentage in ServiceLink				205
Net decrease in total equity		205	0	205	0
Net income attributable to FNF common shareholders and change in total equity		583	250	831	722
Additional Paid-in Capital
Class of Stock [Line Items]
Increase in additional paid-in-capital and decrease in non controlling interest from increase in ownership percentage in ServiceLink		158	0	158	0
Non-controlling Interest
Class of Stock [Line Items]
Increase in additional paid-in-capital and decrease in non controlling interest from increase in ownership percentage in ServiceLink		$ 47	$ 0	$ 47	$ 0
ServiceLink Holdings, LLC
Class of Stock [Line Items]
Purchase of outstanding Class A units of minority owners	$ 90