COMMITMENTS, GUARANTEES, PRODUCT WARRANTIES AND OTHER LOSS CONTINGENCIES - Product Warranties Roll Forward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Movement in Standard Product Warranty Accrual
Balance at beginning of period	$ 2,165	$ 2,192	$ 2,103
Current-year provisions	788	713	945
Expenditures	(913)	(715)	(788)
Other changes	14	(26)	(69)
Balance at end of period	$ 2,054	$ 2,165	$ 2,192