Document and Entity Information Document	3 Months Ended
	Mar. 31, 2021 shares
Document Information [Line Items]
Entity Registrant Name	SERVICE CORPORATION INTERNATIONAL
Entity Central Index Key	0000089089
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Entity Shell Company	false
Amendment Flag	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding	168,837,094
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes