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Reserve for Known and Incurred but Not Reported Claims (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reserve For Known And Incurred But Not Reported Claims [Line Items]
Payments, net of recoveries, related to: Current year	$ 227	$ 292	$ 268
Payments, net of recoveries, related to: Prior years	$ 207	$ 190	$ 203
Provision for title loss, percentage of title premiums and escrow fees	4.00%	4.00%	5.00%
Ultimate loss rate	4.00%	4.00%	4.50%
Estimated percentage increase in loss reserve for prior policy years			0.50%
Estimated increase in loss reserve for prior policy years	$ 0	$ 0	$ 26

X

- Definition

Increase in loss reserve estimates for prior policy years.

+ References

No definition available.

+ Details

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Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The provision for title losses expressed as a percentage of title premiums and escrow fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	faf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage increase in loss reserve estimates for prior policy years.

+ References

No definition available.

+ Details

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Namespace Prefix:	faf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reserve for known and incurred but not reported claims.

+ References

No definition available.

+ Details

Name:	faf_ReserveForKnownAndIncurredButNotReportedClaimsLineItems
Namespace Prefix:	faf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Ultimate loss rate percentage.

+ References

No definition available.

+ Details

Name:	faf_UltimateLossRatePercentage
Namespace Prefix:	faf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration