FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Assets and Liabilities Measured at Fair Value on a Recurring Basis, Narrative (Details) $ in Millions		3 Months Ended
	Dec. 16, 2019 USD ($)	Mar. 31, 2021 USD ($) appeal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Highly liquid investments, maturity period (or less)		3 months
US Securities Litigation | Settled Litigation | NEW JERSEY
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Settlement, escrow fund included in restricted cash | $	$ 1,210	$ 1,210
Settlement, escrow fund included in restricted cash, number of objectors' appeals | appeal		2