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Debt and Credit Facilities - Narrative (Details)	1 Months Ended			12 Months Ended
	Jul. 31, 2022 USD ($)	Feb. 28, 2022 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Oct. 23, 2020
Debt Instrument [Line Items]
Repayments of debt				$ 1,500,000,000	$ 4,750,000,000	$ 2,500,000,000
Debt issued				0
Long-term debt				$ 25,229,000,000	26,695,000,000
Interest expense					940,000,000	$ 1,000,000,000
Immunomedics, Inc. | Measurement Input, Expected Term
Debt Instrument [Line Items]
Liability related to future royalties, measurement Input							16
Senior notes
Debt Instrument [Line Items]
Redemption price, percentage of principal amount repurchased				100.00%
Long-term debt				$ 24,250,000,000
Redemption price, percentage				101.00%
0.75% Senior Unsecured Notes Due in September 2023 | Senior notes
Debt Instrument [Line Items]
Long-term debt				$ 1,498,000,000	1,496,000,000
Interest rate, stated percentage				0.75%
2020 revolving credit facility | Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 2,500,000,000
Debt instrument, term			5 years
Amounts outstanding under the facility				$ 0	$ 0
1.95% Senior Unsecured Notes Due March 2022 | Senior notes
Debt Instrument [Line Items]
Repayments of debt		$ 500,000,000
3.25% Senior Unsecured Notes Due September 2022 | Senior notes
Debt Instrument [Line Items]
Repayments of debt	$ 1,000,000,000
the "2020 Fixed Rate Notes" | Senior notes | Maximum
Debt Instrument [Line Items]
Call feature, period prior to maturity				6 months
the "2020 Fixed Rate Notes" | Senior notes | Minimum
Debt Instrument [Line Items]
Call feature, period prior to maturity				2 months

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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