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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-Sale [Abstract]
Aggregate fair value of investments, unrealized losses	$ 2,100,000,000		$ 2,100,000,000		$ 2,000,000,000
Allowance for credit losses	0		0
Equity investments and equity method investments without readily determinable fair values	415,000,000		415,000,000		$ 338,000,000
Net unrealized loss on investment of equity securities	$ 197,000,000	$ 142,000,000	596,000,000	$ 667,000,000
Equity Securities Donation | Gilead Foundation
Related Party Transaction [Line Items]
Donation expense			$ 85,000,000	$ 212,000,000

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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