Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Feb. 14, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Registrant Name	FIRST AMERICAN FINANCIAL CORPORATION
Trading Symbol	FAF
Entity Central Index Key	0001472787
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 5,676,971,916
Entity Common Stock, Shares Outstanding		103,100,000
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	true
Document Financial Statement Restatement Recovery Analysis [Flag]	true
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common stock, $0.00001 par value
Security Exchange Name	NYSE
Entity File Number	001-34580
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	26-1911571
Entity Address, Address Line One	1 First American Way
Entity Address, City or Town	Santa Ana
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92707-5913
City Area Code	(714)
Local Phone Number	250-3000
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement with respect to the 2024 annual meeting of the stockholders are incorporated by reference in Part III of this report. The definitive proxy statement or an amendment to this Form 10-K will be filed no later than 120 days after the close of registrant’s fiscal year.
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Los Angeles, California
Auditor Firm ID	238