Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 15, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-12139
Entity Registrant Name	SEALED AIR CORP/DE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	65-0654331
Entity Address, Address Line One	2415 Cascade Pointe Boulevard
Entity Address, City or Town	Charlotte
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	28208
City Area Code	980
Local Phone Number	221-3235
Title of 12(b) Security	Common Stock, par value $0.10 per share
Trading Symbol	SEE
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 8,852,200,805
Entity Common Stock, Shares Outstanding		148,158,143
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for its 2022 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001012100