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v3.20.2

Collaboration, License, and Other Agreements - Bayer Narrative (Details) - Bayer | 9 Months Ended
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Sep. 30, 2020
Minimum |
Disaggregation of Revenue [Line Items] |
Revenue based on percentage of annual sales in Japan | 33.50%
Maximum |
Disaggregation of Revenue [Line Items] |
Revenue based on percentage of annual sales in Japan | 40.00%

X
- Definition The percentage on annual sales in Japan that the Company is entitled to receive, subject to certain potential adjustments. + References No definition available. + Details
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Namespace Prefix: | regn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=regn_BayerCollaborationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |