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Financial Instruments - Summary of Assets and Liabilities Carried at Fair Value, Classification of Fair Value Calculations by Category (Detail) - EUR (€) € in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
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Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |
Financial assets at fair value through other comprehensive income | [1] | € 422 | € 370 | € 304
Financial assets at fair value through profit or loss: |  |  |  |
Other |  | 1,845 | 1,684 | 1,915
Fair value [member] |  |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |
Financial assets at fair value through other comprehensive income |  | 422 | 370 | 304
Fair value [member] | Level 1 [member] |  |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |
Financial assets at fair value through other comprehensive income |  | 7 | 5 | 5
Financial assets at fair value through profit or loss: |  |  |  |
Derivatives |  |  |  |
Other |  | 323 | 300 | 260
Liabilities at fair value |  |  |  |
Derivatives |  |  |  |
Contingent consideration |  |  |  |
Fair value [member] | Level 2 [member] |  |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |
Financial assets at fair value through other comprehensive income |  | 3 | 3 | 4
Financial assets at fair value through profit or loss: |  |  |  |
Derivatives | [2] | 187 | 158 | 268
Other |  |  |  |
Liabilities at fair value |  |  |  |
Derivatives | [3] | (311) | (418) | (187)
Contingent consideration |  |  |  |
Fair value [member] | Level 3 [member] |  |  |  |
Disclosure of Detailed Information about Financial Instruments [Line Items] |  |  |  |
Financial assets at fair value through other comprehensive income |  | 412 | 362 | 295
Financial assets at fair value through profit or loss: |  |  |  |
Derivatives |  |  |  |
Other |  | 366 | 328 | 283
Liabilities at fair value |  |  |  |
Derivatives |  |  |  |
Contingent consideration |  | € (159) | € (140) | € (155)
[1] | Included within non-current financial assets at fair value through other comprehensive income are equity investments of €408 million (31 December 2020: €356 million, 30 June 2020: €284 million).
[2] | Includes €115 million (31 December 2020: €78 million, 30 June 2020: €103 million) derivatives, reported within trade receivables, that hedge trading activities.
[3] | Includes €(87) million (31 December 2020: € (103) million, 30 June 2020: €(111) million) derivatives, reported within trade payables, that hedge trading activities.

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