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Goodwill and Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	$ 25,794		$ 25,915
Accumulated Amortization	(10,121)		(8,381)
Foreign Currency Translation Adjustment	1		1
Total	15,674		17,535
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 Assets, Net (Including Goodwill) [Abstract]
Gross  Carrying Amount	39,014		41,835
Accumulated Amortization	(10,121)		(8,381)
Foreign Currency Translation Adjustment	1		1
Net Carrying Amount	28,894		33,455
In Process Research And Development Trodelvy For HR+/HER2-
Intangible Assets, Net (Including Goodwill) [Abstract]
Indefinite-lived intangible assets, fair value	6,100	$ 6,100
Intangible asset – sofosbuvir
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	10,720		10,720
Accumulated Amortization	(6,350)		(5,651)
Foreign Currency Translation Adjustment	0		0
Total	4,370		5,069
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(6,350)		(5,651)
Intangible asset – axicabtagene ciloleucel
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	7,110		7,110
Accumulated Amortization	(1,908)		(1,501)
Foreign Currency Translation Adjustment	0		0
Total	5,202		5,609
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(1,908)		(1,501)
Intangible asset – Trodelvy
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	5,630		5,630
Accumulated Amortization	(973)		(507)
Foreign Currency Translation Adjustment	0		0
Total	4,657		5,123
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(973)		(507)
Intangible asset – Hepcludex
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	845		845
Accumulated Amortization	(158)		(72)
Foreign Currency Translation Adjustment	0		0
Total	687		773
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	(158)		(72)
Other
Finite-Lived Intangible Assets [Line Items]
Gross  Carrying Amount	1,489		1,610
Accumulated Amortization	(733)		(650)
Foreign Currency Translation Adjustment	1		1
Total	758		961
Intangible Assets, Net (Including Goodwill) [Abstract]
Accumulated Amortization	$ (733)		$ (650)

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