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BORROWINGS AND LINES OF CREDIT - Narrative (Details)			1 Months Ended	3 Months Ended
	Mar. 27, 2020 USD ($)	Feb. 10, 2020 USD ($)	Mar. 27, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Feb. 27, 2020 USD ($) debt_series
Debt Instrument [Line Items]
Aggregate principal balance				$ 11,000,000,000.0
Issuance of long-term debt				10,961,000,000	$ 52,000,000
Net transfers to UTC			$ 10,900,000,000	10,948,000,000	89,000,000
Repayment of long-term debt				$ 34,000,000	1,000,000
Weighted average interest rate				2.70%
Interest expense, debt				$ 31,000,000
Interest payable				25,000,000
Debt issuance costs, net				5,000,000
Accumulated amortization, debt issuance costs				$ 700,000
Weighted Average
Debt Instrument [Line Items]
Average maturity of long-term debt				11 years
Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,750,000,000
Issuance of long-term debt	$ 1,750,000,000
Unsecured Debt
Debt Instrument [Line Items]
Aggregate principal balance						$ 9,250,000,000
Series of notes issuance | debt_series						6
Other Debt | Project Financing Arrangements
Debt Instrument [Line Items]
Aggregate principal balance				$ 40,000,000	$ 52,000,000
Commercial Paper
Debt Instrument [Line Items]
Aggregate principal balance				$ 2,000,000,000.0
London Interbank Offered Rate (LIBOR) | Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate		1.125%		1.125%
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 2,000,000,000.0
Commitment fee percentage		0.125%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate				1.25%

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