Merck & Co., Inc.

2420402 - Disclosure - Earnings Per Share - Calculations of Earnings Per Share (Detail)

2420403 - Disclosure - Earnings Per Share - Textual (Detail)

2421402 - Disclosure - Other Comprehensive Income (Loss) - Changes in AOCI by Component (Detail)

2421403 - Disclosure - Other Comprehensive (Loss) Income - Textual (Detail)

2422402 - Disclosure - Segment Reporting - Textual (Detail)

2422403 - Disclosure - Segment Reporting - Sales of Company's Products (Detail)

2422404 - Disclosure - Segment Reporting - Consolidated Revenues by Geographic Area (Detail)

2422405 - Disclosure - Segment Reporting - Reconciliation of Segment Profits to Income Before Taxes (Detail)

2422406 - Disclosure - Segment Reporting - Schedule of Equity Income from Affiliates and Depreciation and Amortization Included in Segment Profits (Detail)

2422407 - Disclosure - Segment Reporting - Property, Plant and Equipment, Net by Geographic Area (Detail)

2104100 - Disclosure - Summary of Accounting Policies

2105100 - Disclosure - Restructuring

2106100 - Disclosure - Acquisitions, Divestitures, Research Collaborations and License Agreements Acquisitions, Divestitures, Research Collaborations and License Agreements

2109100 - Disclosure - Financial Instruments

2110100 - Disclosure - Inventories

2111100 - Disclosure - Goodwill and Other Intangibles

2112100 - Disclosure - Joint Ventures and Other Equity Method Affiliates

2113100 - Disclosure - Loans Payable, Long-Term Debt and Other Commitments

2114100 - Disclosure - Contingencies and Environmental Liabilities

2115100 - Disclosure - Equity

0001000 - Document - Document and Entity Information

2116100 - Disclosure - Share-Based Compensation Plans

2117100 - Disclosure - Pension and Other Postretirement Benefit Plans

2118100 - Disclosure - Other (Income) Expense, Net

2119100 - Disclosure - Taxes on Income

2120100 - Disclosure - Earnings per Share

2121100 - Disclosure - Other Comprehensive Income (Loss)

2122100 - Disclosure - Segment Reporting

2204201 - Disclosure - Summary of Accounting Policies Summary of Accounting Policies (Policies)

2305301 - Disclosure - Restructuring (Tables)

2309301 - Disclosure - Financial Instruments (Tables)

1001000 - Statement - Consolidated Statement of Income

2310301 - Disclosure - Inventories (Tables)

2311301 - Disclosure - Goodwill and Other Intangibles (Tables)

2312301 - Disclosure - Joint Ventures and Other Equity Method Affiliates (Tables)

2313301 - Disclosure - Loans Payable, Long-Term Debt and Other Commitments (Tables)

2315301 - Disclosure - Equity (Tables)

2316301 - Disclosure - Share-Based Compensation Plans (Tables)

2317301 - Disclosure - Pension and Other Postretirement Benefit Plans (Tables)

2318301 - Disclosure - Other (Income) Expense, Net (Tables)

2319301 - Disclosure - Taxes on Income (Tables)

2320301 - Disclosure - Earnings per Share (Tables)

1002000 - Statement - Consolidated Statement of Comprehensive Income

2321301 - Disclosure - Other Comprehensive Income (Loss) (Tables)

2322301 - Disclosure - Segment Reporting (Tables)

2401401 - Disclosure - Nature of Operations Nature of Operations (Details)

2404402 - Disclosure - Summary of Accounting Policies - Textual (Detail)

2405402 - Disclosure - Restructuring - Charges Related to Restructuring Program Activities by Type of Cost (Detail)

2405403 - Disclosure - Restructuring - Charges and Spending Relating to Restructuring Activities by Program (Detail)

2405404 - Disclosure - Restructuring - Textual (Detail)

2406401 - Disclosure - Acquisitions, Divestitures, Research Collaborations and License Agreements - Textual (Detail)

2409402 - Disclosure - Financial Instruments - Fair Value of Derivatives Segregated Between Those Derivatives That are Designated as Hedging Instruments and Those That are Not Designated as Hedging Instruments (Detail)

2409403 - Disclosure - Financial Instruments - Information on Derivative Positions Subject to Master Netting Arrangements as if they were Presented on a Net Basis (Detail)

1003000 - Statement - Consolidated Balance Sheet

2409404 - Disclosure - Financial Instruments - Location and Pretax Gain or Loss Amounts for Derivatives (Detail)

2409405 - Disclosure - Financial Instruments - Information on Available-for-sale Investments (Detail)

2409406 - Disclosure - Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

2409407 - Disclosure - Financial Instruments - Textual (Detail)

2410402 - Disclosure - Inventories - Inventories (Detail)

2410403 - Disclosure - Inventories - Textual (Detail)

2411402 - Disclosure - Goodwill and Other Intangibles - Goodwill Activity by Segment (Detail)

2411403 - Disclosure - Goodwill and Other Intangibles - Other Intangibles (Detail)

2411404 - Disclosure - Goodwill and Other Intangibles - Textual (Detail)

2412402 - Disclosure - Joint Ventures and Other Equity Method Affiliates - Equity Income from Affiliates (Detail)

1003501 - Statement - Consolidated Balance Sheet (Parenthetical)

2412403 - Disclosure - Joint Ventures and Other Equity Method Affiliates - Summarized Financial Information for AZLP (Detail)

2412404 - Disclosure - Joint Ventures and Other Equity Method Affiliates - Summarized Financial Information for Affiliates (Excluding AZLP) (Detail)

2412405 - Disclosure - Joint Ventures and Other Equity Method Affiliates - Textual (Detail)

2413402 - Disclosure - Loans Payable, Long-Term Debt and Other Commitments - Long-Term Debt (Detail)

2413403 - Disclosure - Loans Payable, Long-Term Debt and Other Commitments - Textual (Detail)

2414401 - Disclosure - Contingencies and Environmental Liabilities - Vioxx Litigation - Textual (Detail)

2414402 - Disclosure - Contingencies and Environmental Liabilities - Fosamax Product Liability Litigation - Textual (Detail)

2414403 - Disclosure - Contingencies and Environmental Liabilities Contingencies and Environmental Liabilities - Januvia/Janumet Litigation (Details)

2414404 - Disclosure - Contingencies and Environmental Liabilities - NuvaRing Litigation - Textual (Detail)

2414405 - Disclosure - Contingencies and Environmental Liabilities - Propecia/Proscar Litigation - Textual (Detail)

1004000 - Statement - Consolidated Statement of Equity

2414406 - Disclosure - Contingencies and Environmental Liabilities - Vytorin/Zetia Litigation - Textual (Detail)

2414407 - Disclosure - Contingencies and Environmental Liabilities - AWP Litigation - Textual (Detail)

2414408 - Disclosure - Contingencies and Environmental Liabilities - Environmental Litigation and Matters - Textual (Detail)

2414409 - Disclosure - Contingencies and Environmental Liabilities - Legal Defense Reserves - Textual (Detail)

2415402 - Disclosure - Equity - Shareholders' Equity (Detail)

2415403 - Disclosure - Equity - Textual (Detail)

2416402 - Disclosure - Share-Based Compensation Plans - Assumptions Used to Determine Weighted-Average Fair Value of Options Granted (Detail)

2416403 - Disclosure - Share-Based Compensation Plans - Summary of Information Relative to Stock Option Plan Activity (Detail)

2416404 - Disclosure - Share-Based Compensation Plans - Additional Information Pertaining to Stock Option Plans (Detail)

2416405 - Disclosure - Share-Based Compensation Plans - Summary of Nonvested RSU and PSU Activity (Detail)

1004501 - Statement - Consolidated Statement of Equity (Parenthetical)

2416406 - Disclosure - Share-Based Compensation Plans - Textual (Detail)

2417402 - Disclosure - Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Detail)

2417403 - Disclosure - Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Detail)

2417404 - Disclosure - Pension and Other Postretirement Benefit Plans - Fair Values of Pension Plan Assets (Detail)

2417405 - Disclosure - Pension and Other Postretirement Benefit Plans - Summary of Changes in Fair Value of Company's Level 3 Pension Plan Assets (Detail)

2417406 - Disclosure - Pension and Other Postretirement Benefit Plans - Fair Values of Other Postretirement Benefit Plan Assets (Detail)

2417407 - Disclosure - Pension and Other Postretirement Benefit Plans - Summary of Expected Benefit Payments (Detail)

2417408 - Disclosure - Pension and Other Postretirement Benefit Plans - Components of Other Comprehensive Income (Detail)

2417409 - Disclosure - Pension and Other Postretirement Benefit Plans - Summary of Weighted Average Assumptions Used in Determining Pension Plan and U.S. Pension and Other Postretirement Benefit Plan Information (Detail)

2417410 - Disclosure - Pension and Other Postretirement Benefit Plans - Summary of Health Care Cost Trend Rate Assumptions for Other Postretirement Benefit Plans (Detail)

1005000 - Statement - Consolidated Statement of Cash Flows

2417411 - Disclosure - Pension and Other Postretirement Benefit Plans - One Percentage Point Change in Health Care Cost Trend Rate (Detail)

2417412 - Disclosure - Pension and Other Postretirement Benefit Plans - Textual (Detail)

2418402 - Disclosure - Other (Income) Expense, Net (Detail)

2418403 - Disclosure - Other (Income) Expense, Net - Textual (Detail)

2419402 - Disclosure - Taxes on Income - Reconciliation Between Effective Tax Rate and US Statutory Rate (Detail)

2419403 - Disclosure - Taxes on Income - Income Before Taxes (Detail)

2419404 - Disclosure - Taxes on Income - Taxes on Income (Detail)

2419405 - Disclosure - Taxes on Income - Deferred Income Taxes (Detail)

2419406 - Disclosure - Taxes on Income - Unrecognized Tax Benefits (Detail)

2419407 - Disclosure - Taxes on Income - Textual (Detail)

2101100 - Disclosure - Nature of Operations