RELATED PARTIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Contributions of assets and (liabilities) from parent, net	$ 79
Impairment charge on minority owned joint venture investment	71	$ 0
Spinoff
Related Party Transaction [Line Items]
Separation costs	45	0
UTC
Related Party Transaction [Line Items]
Revenue from related parties	3	6
Related party transaction, selling, general and administrative expenses from transactions with related party	43	54
Accounts receivable, related parties	3		$ 16,000
Accounts payable, related parties	258		3,000
Interest income, related party	0	28
Interest expense, related party	0	16
Accounts receivable, related parties, current	1		6
Accounts payable, related parties, current	0		4
Equity Method Investee
Related Party Transaction [Line Items]
Revenue from related parties	344	394
Accounts receivable, related parties	191		137
Accounts payable, related parties	38		$ 55
Related party costs	77	$ 77
Impairment charge on minority owned joint venture investment	$ 71

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