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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount		$ 24,666	$ 22,897
Accumulated Amortization		(7,055)	(6,660)
Foreign Currency Translation Adjustment		0	(1)
Net Carrying Amount		17,611	16,236
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Gross  Carrying Amount		41,836	39,787
Accumulated Amortization		(7,055)	(6,660)
Foreign Currency Translation Adjustment		0	(1)
Net Carrying Amount		34,781	33,126
Acquired IPR&D
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Gross  Carrying Amount		17,170	16,890
Foreign Currency Translation Adjustment		0	0
Net Carrying Amount		17,170	16,890
Intangible assets reclassified from indefinite-lived assets		(910)
Forecast | Subsequent Event | Acquired IPR&D
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Reclassified amounts	$ 1,000
Intangible asset - sofosbuvir
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount		10,720	10,720
Accumulated Amortization		(5,127)	(4,952)
Foreign Currency Translation Adjustment		0	0
Net Carrying Amount		5,593	5,768
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Accumulated Amortization		(5,127)	(4,952)
Intangible asset - axicabtagene ciloleucel
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount		7,110	6,200
Accumulated Amortization		(1,196)	(1,105)
Foreign Currency Translation Adjustment		0	0
Net Carrying Amount		5,914	5,095
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Intangible assets reclassified from indefinite-lived assets		910
Accumulated Amortization		(1,196)	(1,105)
Intangible asset - Trodelvy for mTNBC
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount		4,600	4,600
Accumulated Amortization		(158)	(63)
Foreign Currency Translation Adjustment		0	0
Net Carrying Amount		4,442	4,537
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Accumulated Amortization		(158)	(63)
Intangible asset - Hepcludex for HDV
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount		845	0
Accumulated Amortization		(7)	0
Foreign Currency Translation Adjustment		0	0
Net Carrying Amount		838	0
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Accumulated Amortization		(7)	0
Other
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount		1,391	1,377
Accumulated Amortization		(567)	(540)
Foreign Currency Translation Adjustment		0	(1)
Net Carrying Amount		824	836
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Accumulated Amortization		$ (567)	$ (540)

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