XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Restructuring - Charges Activities by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  |  | $ 422 |
Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | $ 177 |  | 422 |
Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | $ 236 |  | $ 333
Accelerated Depreciation |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  |  | 131 |
Accelerated Depreciation | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 66 |  | 131 |
Accelerated Depreciation | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 22 |  | 43
Separation Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  |  | 111 |
Separation Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 19 |  | 111 |
Separation Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 110 |  | 151
Other Exit Costs |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  |  | 180 |
Other Exit Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 92 |  | 180 |
Other Exit Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 104 |  | 139
Cost of sales | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 66 |  | 182 |
Cost of sales | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 32 |  | 61
Cost of sales | Accelerated Depreciation | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 66 |  | 131 |
Cost of sales | Accelerated Depreciation | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 22 |  | 43
Cost of sales | Separation Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 0 |
Cost of sales | Separation Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 0 |  | 0
Cost of sales | Other Exit Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 51 |
Cost of sales | Other Exit Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 10 |  | 18
Selling, general and administrative | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 31 |  | 36 |
Selling, general and administrative | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 52 |  | 53
Selling, general and administrative | Accelerated Depreciation | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 0 |
Selling, general and administrative | Accelerated Depreciation | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 0 |  | 0
Selling, general and administrative | Separation Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 0 |
Selling, general and administrative | Separation Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 0 |  | 0
Selling, general and administrative | Other Exit Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 31 |  | 36 |
Selling, general and administrative | Other Exit Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 52 |  | 53
Research and development | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 2 |
Research and development | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 1 |  | 1
Research and development | Accelerated Depreciation | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 0 |
Research and development | Accelerated Depreciation | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 0 |  | 0
Research and development | Separation Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 0 |
Research and development | Separation Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 0 |  | 0
Research and development | Other Exit Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 2 |
Research and development | Other Exit Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 1 |  | 1
Restructuring costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 80 |  | 202 |
Restructuring costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 151 |  | 218
Restructuring costs | Accelerated Depreciation | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 0 |  | 0 |
Restructuring costs | Accelerated Depreciation | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 0 |  | 0
Restructuring costs | Separation Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | 19 |  | 111 |
Restructuring costs | Separation Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | 110 |  | 151
Restructuring costs | Other Exit Costs | Restructuring Program, 2024 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs | $ 61 |  | $ 91 |
Restructuring costs | Other Exit Costs | Restructuring Program, 2019 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total pretax restructuring costs |  | $ 41 |  | $ 67

X
- Definition Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
Name: | us-gaap_RestructuringAndRelatedCostIncurredCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
Name: | us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RestructuringPlanAxis=mrk_RestructuringProgram2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringPlanAxis=mrk_RestructuringProgram2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=mrk_AcceleratedDepreciationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RestructuringCostAndReserveAxis=us-gaap_OtherRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_RestructuringChargesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |