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Deposits (Escrow, Savings and Investment Certificate Accounts) (Detail) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Banking And Thrifts [Abstract]
Interest bearing		$ 2,792	$ 1,650
Non-interest bearing		2,083	1,439
Escrow accounts		4,875	3,089
Business checking and other deposits (1)	[1]	194	188
Deposits, Total		$ 5,069	$ 3,277
Weighted average interest rate, Interest bearing escrow accounts		0.10%	0.13%
[1] Accounts are primarily non-interest bearing.

X

- Definition

Banking and thrifts.

+ References

No definition available.

+ Details

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X

- Definition

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

+ References

No definition available.

+ Details

Name:	faf_EscrowDepositLiability
Namespace Prefix:	faf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Weighted average interest rates on interest bearing escrow accounts.

+ References

No definition available.

+ Details

Name:	faf_WeightedAverageInterestRatesOnInterestBearingEscrowAccounts
Namespace Prefix:	faf_
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X

- Definition

The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Name:	us-gaap_DemandDepositAccounts
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X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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X

- Definition

The aggregate of all domestic and foreign interest-bearing deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Name:	us-gaap_InterestBearingDepositLiabilities
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X

- Definition

The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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