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Fair value measurements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Percentage of postretirement benefit plan assets comprised of pension plan assets (more than)	97.00%

X

- Definition

Percentage of postretirement benefit plan assets in company's pension plan assets.

+ References

No definition available.

+ Details

Name:	son_PercentageOfPostretirementBenefitPlanAssetsInCompanysPensionPlanAssets
Namespace Prefix:	son_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration