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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	$ 25,919	$ 25,915
Accumulated Amortization	(9,254)	(8,381)
Foreign Currency Translation Adjustment	1	1
Net Carrying Amount	16,665	17,535
Intangible Assets, Net (Including Goodwill) [Abstract]
Gross  Carrying Amount	39,139	41,835
Accumulated Amortization	(9,254)	(8,381)
Foreign Currency Translation Adjustment	1	1
Net Carrying Amount	29,885	33,455
Indefinite-lived assets – IPR&D
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Gross  Carrying Amount	13,220	15,920
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	13,220	15,920
Intangible asset – sofosbuvir
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	10,720	10,720
Accumulated Amortization	(6,001)	(5,651)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	4,719	5,069
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(6,001)	(5,651)
Intangible asset – axicabtagene ciloleucel
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	7,110	7,110
Accumulated Amortization	(1,704)	(1,501)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	5,406	5,609
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(1,704)	(1,501)
Intangible asset – Trodelvy
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	5,630	5,630
Accumulated Amortization	(740)	(507)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	4,890	5,123
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(740)	(507)
Intangible asset – Hepcludex
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	845	845
Accumulated Amortization	(115)	(72)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	730	773
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(115)	(72)
Other
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	1,614	1,610
Accumulated Amortization	(695)	(650)
Foreign Currency Translation Adjustment	1	1
Net Carrying Amount	920	961
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	$ (695)	$ (650)

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