Acquisitions - Pro Forma Information (Details) - F&G - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Total revenues	$ 2,976	$ 2,669	$ 7,127	$ 7,517
Net earnings attributable to FNF common shareholders	$ 378	$ 294	$ 432	$ 876