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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2021	Sep. 30, 2021	Mar. 04, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount				$ 25,715		$ 22,897
Accumulated Amortization				(7,936)		(6,660)
Foreign Currency Translation Adjustment				1		(1)
Net Carrying Amount				17,780		16,236
Intangible Assets, Net (Including Goodwill) [Abstract]
Gross  Carrying Amount				41,835		39,787
Accumulated Amortization				(7,936)		(6,660)
Foreign Currency Translation Adjustment				1		(1)
Net Carrying Amount				33,900		33,126
Acquired IPR&D
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Gross  Carrying Amount				16,120		16,890
Foreign Currency Translation Adjustment				0		0
Net Carrying Amount				16,120		16,890
Intangible Assets, Net (Including Goodwill) [Abstract]
Reclassified amounts	$ (1,000)	$ (910)
Acquired IPR&D | Forecast | Subsequent Event
Intangible Assets, Net (Including Goodwill) [Abstract]
Reclassified amounts			$ (200)
Acquired IPR&D | MYR GmbH
Intangible Assets, Net (Including Goodwill) [Abstract]
Acquired IPR&D		1,200			$ 1,190
Intangible asset - sofosbuvir
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount				10,720		10,720
Accumulated Amortization				(5,477)		(4,952)
Foreign Currency Translation Adjustment				0		0
Net Carrying Amount				5,243		5,768
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization				(5,477)		(4,952)
Intangible asset - axicabtagene ciloleucel
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount				7,110		6,200
Accumulated Amortization				(1,400)		(1,105)
Foreign Currency Translation Adjustment				0		0
Net Carrying Amount				5,710		5,095
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization				(1,400)		(1,105)
Reclassified amounts		$ 910
Intangible asset - Trodelvy
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount				5,630		4,600
Accumulated Amortization				(390)		(63)
Foreign Currency Translation Adjustment				0		0
Net Carrying Amount				5,240		4,537
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization				(390)		(63)
Reclassified amounts	$ 1,000
Intangible asset - Hepcludex
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount				845		0
Accumulated Amortization				(50)		0
Foreign Currency Translation Adjustment				0		0
Net Carrying Amount				795		0
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization				(50)		0
Other
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount				1,410		1,377
Accumulated Amortization				(619)		(540)
Foreign Currency Translation Adjustment				1		(1)
Net Carrying Amount				792		836
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization				$ (619)		$ (540)
Tecartus | Forecast | Subsequent Event
Intangible Assets, Net (Including Goodwill) [Abstract]
Reclassified amounts			$ 200

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