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Document and Entity Information
Jul. 27, 2021
Cover [Abstract]  
Entity Registrant Name First American Financial Corp
Amendment Flag false
Entity Central Index Key 0001472787
Document Type 8-K
Document Period End Date Jul. 27, 2021
Entity Incorporation State Country Code DE
Entity File Number 001-34580
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.00001 par value
Trading Symbol FAF
Security Exchange Name NYSE
Entity Emerging Growth Company false