Summary of Significant Accounting Policies - Tax Indemnification Agreement (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Tax Matters Agreement
Income Taxes [Line Items]
Indemnity outstanding for past and potential future tax payments	$ 106	$ 128

Due to honeywell for past and potential future tax payments.

No definition available.

Name:	rezi_DueToHoneywellForPastAndPotentialFutureTaxPayments
Namespace Prefix:	rezi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant