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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	$ 25,937	$ 25,915
Accumulated Amortization	(8,827)	(8,381)
Foreign Currency Translation Adjustment	1	1
Net Carrying Amount	17,111	17,535
Intangible Assets, Net (Including Goodwill) [Abstract]
Gross  Carrying Amount	39,157	41,835
Accumulated Amortization	(8,827)	(8,381)
Foreign Currency Translation Adjustment	1	1
Net Carrying Amount	30,331	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	(5,826)	(5,651)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	4,894	5,069
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(5,826)	(5,651)
Intangible asset - axicabtagene ciloleucel
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	7,110	7,110
Accumulated Amortization	(1,603)	(1,501)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	5,507	5,609
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(1,603)	(1,501)
Intangible asset - Trodelvy
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	5,630	5,630
Accumulated Amortization	(623)	(507)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	5,007	5,123
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(623)	(507)
Intangible asset - Hepcludex
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	845	845
Accumulated Amortization	(93)	(72)
Foreign Currency Translation Adjustment	0	0
Net Carrying Amount	752	773
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(93)	(72)
Other
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	1,632	1,610
Accumulated Amortization	(682)	(650)
Foreign Currency Translation Adjustment	1	1
Net Carrying Amount	951	961
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	$ (682)	$ (650)

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