Goodwill and Intangible Assets - Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets
Gross carrying amount	$ 90,535		$ 83,333
Accumulated amortization	(29,890)		(28,026)
Net carrying amount	60,645		55,307
Indefinite-lived intangible assets	1,580		303
Total intangible assets gross carrying amount	92,115		83,636
Intangible assets, net	62,225		55,610
Amortization expense	1,891	$ 1,948
Indefinite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	0	710
AGN-151607 \| Research and development
Indefinite-Lived Intangible Assets [Line Items]
Impairment of intangible assets		$ 630
Developed product rights
Finite-Lived Intangible Assets
Gross carrying amount	82,219		75,142
Accumulated amortization	(24,059)		(22,455)
Net carrying amount	58,160		52,687
License agreements
Finite-Lived Intangible Assets
Gross carrying amount	8,316		8,191
Accumulated amortization	(5,831)		(5,571)
Net carrying amount	$ 2,485		$ 2,620

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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