LEASES AND COMMITMENTS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating leases	$ 152	$ 4
Operating lease costs	29	24
Operating cash flows for operating leases	29	24
Short-term lease costs	21	18
Operating leases, rent expense, net			$ 42
Delphi Technologies
Lessee, Lease, Description [Line Items]
Operating leases	$ 159	$ 159