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Share-Based Compensation Plans - Summary of Nonvested RSU and PSU Activity (Details) shares in Thousands | 12 Months Ended
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Dec. 31, 2021 $ / shares shares
RSUs |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Number of Shares, Nonvested January 1 (in shares) | shares | 11,915
Number of Shares, Granted (in shares) | shares | 7,897
Number of Shares, Vested (in shares) | shares | (6,066)
Number of Shares, Forfeited (in shares) | shares | (1,015)
Number of Shares, Awards transferred to Organon in the spin-off | shares | (1,309)
Number of Shares, Adjustment to Merck awards related to the spin-off of Organon (in shares) | shares | 368
Number of Shares, Nonvested December 31 (in shares) | shares | 11,790
Number of Shares, Expected to Vest (in shares) | shares | 10,499
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |
Weighted Average Grant Date Fair Value, Nonvested January 1 (in dollars per share) | $ / shares | $ 74.17
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares | 76.16
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares | 70.25
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares | 76.62
Weighted Average Grant Date Fair Value, Awards transferred to Organon in the spin-off of Organon (in dollars per share) | $ / shares | 76.99
Weighted Average Grant Date Fair Value, Adjustment to Merck awards related to the spin-off of Organon (in dollars per share) | $ / shares | 0
Weighted Average Grant Date Fair Value, Nonvested December 31 (in dollars per share) | $ / shares | 74.88
Weighted Average Grant Date Fair Value, Expected to vest (in dollars per share) | $ / shares | $ 74.93
PSUs |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |
Number of Shares, Nonvested January 1 (in shares) | shares | 2,100
Number of Shares, Granted (in shares) | shares | 1,487
Number of Shares, Vested (in shares) | shares | (1,284)
Number of Shares, Forfeited (in shares) | shares | (149)
Number of Shares, Awards transferred to Organon in the spin-off | shares | (248)
Number of Shares, Adjustment to Merck awards related to the spin-off of Organon (in shares) | shares | 60
Number of Shares, Nonvested December 31 (in shares) | shares | 1,966
Number of Shares, Expected to Vest (in shares) | shares | 1,832
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |
Weighted Average Grant Date Fair Value, Nonvested January 1 (in dollars per share) | $ / shares | $ 75.08
Weighted Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares | 69.33
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares | 57.14
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) | $ / shares | 79.33
Weighted Average Grant Date Fair Value, Awards transferred to Organon in the spin-off of Organon (in dollars per share) | $ / shares | 77.39
Weighted Average Grant Date Fair Value, Adjustment to Merck awards related to the spin-off of Organon (in dollars per share) | $ / shares | 0
Weighted Average Grant Date Fair Value, Nonvested December 31 (in dollars per share) | $ / shares | 77.13
Weighted Average Grant Date Fair Value, Expected to vest (in dollars per share) | $ / shares | $ 77.40

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Expected to Vest, Number + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Transferred due to Spinoff Transaction + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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