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Inventory - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
Inventory write-down		$ 291	$ 495	$ 2,200
Inventory, firm purchase commitment, loss		24	60	$ 141
Loss on future firm purchase commitments		5	60
Inventory, gross		$ 267	$ 267
Raw Materials
Inventory [Line Items]
Inventory write-down	$ 903
COVID Vaccine | Minimum
Inventory [Line Items]
Shelf life (in months)		9 months
COVID Vaccine | Maximum
Inventory [Line Items]
Shelf life (in months)		12 months
mNEXSPIKE
Inventory [Line Items]
Shelf life (in months)		12 months
RSV Vaccine
Inventory [Line Items]
Shelf life (in months)		18 months

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- Definition

Amount of loss recognized on firm purchase commitment for inventory.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-SubTopic 10
-Topic 330
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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- Definition

Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 330
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483080/330-10-50-2

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