Cover Page Details - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document Information [Line Items]
Document Quarterly Report	true
Document Type	10-Q
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Entity File Number	1-6402-1
Entity Registrant Name	SERVICE CORPORATION INTERNATIONAL
Entity Incorporation, State or Country Code	TX
Entity Tax Identification Number	74-1488375
Entity Address, Address Line One	1929 Allen Parkway
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77019
City Area Code	(713)
Local Phone Number	522-5141
Title of 12(b) Security	Common Stock ($1 par value)
Trading Symbol	SCI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	168,837,094
Subsequent Event [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		168,141,372