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Regulation and Equity - Equity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Aug. 03, 2021
Class of Stock [Line Items]
Stock repurchase program number of shares authorized (in shares)				25,000,000
Treasury stock repurchased	$ 4	$ 549	$ 461
FNF Common Stock | Share Repurchase Program
Class of Stock [Line Items]
Treasury stock repurchased (in shares)	100,000
Treasury stock repurchased	$ 4
Treasury stock acquired (in usd per share)	$ 38.45

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