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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Equity investments not measured at fair value	$ 69		$ 58
Equity investments without readily determinable fair values	225		204
Net losses from equity securities	(351)	$ (283)
Level 2 | MYR GmbH | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability for MYR contingent consideration	0		0
Level 3 | MYR GmbH | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability for MYR contingent consideration	341		0
Market value | MYR GmbH | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability for MYR contingent consideration	341		0
Market value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term and long-term debt	31,600		34,600
Carrying value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term and long-term debt, carrying values	$ 29,100		$ 30,300

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