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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Net loss from equity securities	$ 142	$ 964	$ 667	$ 1,046
Equity investments not measured at fair value	96		96			$ 58
Equity investments without readily determinable fair values	211		211			204
Level 2 | MYR GmbH | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability for MYR GmbH (“MYR”) contingent consideration	0		0			0
Level 3 | MYR GmbH | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability for MYR GmbH (“MYR”) contingent consideration	328		328		$ 341	0
Market value | MYR GmbH | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Liability for MYR GmbH (“MYR”) contingent consideration	328		328			0
Market value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term and long-term debt	29,600		29,600			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	$ 26,600		26,600			$ 30,300
Equity Securities Donation | Gilead Foundation
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Donation expense			$ 212

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