ACQUISITIONS - Fair values of assets acquired and liabilities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 01, 2020
ASSETS
Goodwill	$ 2,627	$ 2,627	$ 1,842
LIABILITIES
Amortization of inventory fair value adjustment		$ 27	$ 0	$ 0
Delphi Technologies PLC
ASSETS
Cash and cash equivalents					$ 460
Receivables, net					901
Inventories, net					398
Prepayments and other current assets					77
Property, plant and equipment, net					1,548
Investments and other long-term receivables					103
Goodwill					710
Other intangible assets, net					760
Other non-current assets					359
Total assets acquired					5,316
LIABILITIES
Notes payable and other short-term debt					2
Accounts payable					692
Other current liabilities					609
Long-term debt					934
Retirement-related					313
Other					286
Total liabilities assumed					2,836
Noncontrolling interests					89
Net assets and noncontrolling interests acquired					$ 2,391
Amortization of inventory fair value adjustment	$ 27