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Regulation and Equity - Equity (Details) - USD ($) $ / shares in Units, $ in Millions		2 Months Ended	12 Months Ended
	Jul. 31, 2024	Feb. 21, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Aug. 03, 2021
Class of Stock [Line Items]
Treasury stock repurchased				$ 4	$ 549
2021 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program number of shares authorized (in shares)						25,000,000
2024 Repurchase Program
Class of Stock [Line Items]
Stock repurchase program number of shares authorized (in shares)	25,000,000
Stock repurchase program, period	3 years
FNF Common Stock | 2021 Repurchase Program
Class of Stock [Line Items]
Treasury stock repurchased (in shares)			0	100,000
Treasury stock repurchased			$ 4
Treasury stock acquired (in usd per share)			$ 38.45
FNF Common Stock | 2024 Repurchase Program
Class of Stock [Line Items]
Treasury stock repurchased (in shares)			0
FNF Common Stock | 2024 Repurchase Program | Subsequent Event
Class of Stock [Line Items]
Treasury stock repurchased (in shares)		0

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