COMMITMENTS AND CONTINGENCIES 8 (Details) € in Millions, $ in Millions	9 Months Ended	10 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($)	Oct. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 EUR (€)
Garrett Indemnification And Reimbursement Receivables [Member]
Loss Contingencies [Line Items]
Reimbursement Receivables	$ 1,400
Resideo [Member] | Environmental Liabilities [Member]
Loss Contingencies [Line Items]
Indemnification and reimbursement agreement annual cap	140
Indemnification and reimbursement agreement minimum amount	25
Reimbursements from indemnification and reimbursement agreement	70
Reimbursement receivable indemnification and reimbursement agreement	107
Indemnity and reimbursement receivable recorded In Other Current Assets	140
Indemnity and reimbursement receivable recorded In Other Assets	482
Resideo [Member] | Environmental Liabilities [Member] | Forecast [Member] | Original Due Date April 30, 2020 [Member]
Loss Contingencies [Line Items]
Reimbursements from indemnification and reimbursement agreement		$ 35
Garrett [Member] | Bendix Asbestos Loss Contingency Liability [Member]
Loss Contingencies [Line Items]
Indemnification and reimbursement agreement annual cap	175			€ 150
Indemnification and reimbursement agreement minimum amount	25
Reimbursements from indemnification and reimbursement agreement	36
Reimbursement receivable indemnification and reimbursement agreement	38
Garrett [Member] | Bendix Asbestos Loss Contingency Liability [Member] | Garrett Indemnification And Reimbursement [Member]
Loss Contingencies [Line Items]
Reimbursement Receivables	1,121
Garrett [Member] | Bendix Asbestos Loss Contingency Liability [Member] | Garrett Tax Matters Agreement [Member]
Loss Contingencies [Line Items]
Reimbursement Receivables	273
Garrett [Member] | Bendix Asbestos Loss Contingency Liability [Member] | Garrett Other Receivables [Member]
Loss Contingencies [Line Items]
Reimbursement Receivables	13
Garrett [Member] | Bendix Asbestos Loss Contingency Liability [Member] | Garrett Indemnification And Reimbursement Receivables [Member]
Loss Contingencies [Line Items]
Reimbursement Receivables	$ 1,407
Garrett [Member] | Bendix Asbestos Loss Contingency Liability [Member] | Forecast [Member] | Original Due Date April 1, 2020 [Member] | Garrett Tax Matters Agreement [Member]
Loss Contingencies [Line Items]
Reimbursement receivable indemnification and reimbursement agreement			$ 18
Garrett [Member] | Bendix Asbestos Loss Contingency Liability [Member] | Forecast [Member] | Original Due Date May 1, 2020 [Member] | Garrett Indemnification And Reimbursement [Member]
Loss Contingencies [Line Items]
Reimbursement receivable indemnification and reimbursement agreement			$ 2