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Net Product Sales - Schedule of Changes in Balances of Receivables and Contract Liabilities (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2026 USD ($)
Change in Contract with Customer, Liability Refund [Roll Forward] |
Balance at December 31, 2025 | $ (509)
Balance at March 31, 2026 | (470)
Net product sales |
Change in Contract with Customer, Liability Refund [Roll Forward] |
Balance at December 31, 2025 | (509)
Provision related to sales made in current period | (9)
Provision related to sales made in prior periods | 0
Payments and returns related to sales made in current period | 0
Payments and returns related to sales made in prior year | 48
Balance at March 31, 2026 | $ (470)

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- Definition Change in Contract with Customer, Liability Refund + References No definition available. + Details
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- Definition Contract with Customer, Liability, Provision Related To Sales + References No definition available. + Details
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Namespace Prefix: | mrna_
Data Type: | xbrli:monetaryItemType
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- Definition Contract with Customer, Liability, Provisions Made in Current Year + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Contract with Customer, Liability, Provisions Made in Prior Years + References No definition available. + Details
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Namespace Prefix: | mrna_
Data Type: | xbrli:monetaryItemType
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- Definition Contract with Customer, Refund Liability, Payments And Returns Related To Prior Period Sales + References No definition available. + Details
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Namespace Prefix: | mrna_
Data Type: | xbrli:monetaryItemType
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- Definition Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 27 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-27 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |