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Regulation and Equity - Equity (Details) - USD ($) $ / shares in Units, $ in Millions	2 Months Ended	12 Months Ended
	Feb. 23, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Aug. 03, 2021
Class of Stock [Line Items]
Stock repurchase program number of shares authorized (in shares)					25,000,000
Treasury stock repurchased		$ 461	$ 244	$ 85
FNF Common Stock | Share Repurchase Program
Class of Stock [Line Items]
Treasury stock repurchased (in shares)		10,180,000
Treasury stock repurchased		$ 461
Treasury stock acquired (in usd per share)		$ 45.22
FNF Common Stock | Share Repurchase Program | Subsequent Event
Class of Stock [Line Items]
Treasury stock repurchased (in shares)	250,000
Treasury stock repurchased	$ 13
Treasury stock acquired (in usd per share)	$ 52.60

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