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Goodwill and Intangible Assets - Additional Information (Detail) € in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 EUR (€) GeographicalAreas Divisions | Dec. 31, 2017 EUR (€)
Disclosure of detailed information about intangible assets [line items] |  |
Number of divisions included in cash generating units | Divisions | 3 |
Number of geographical areas included in cash generating units | GeographicalAreas | 3 |
Number of cash generating units | 9 |
Goodwill | € 17,341 | € 16,881
Pre-tax discount rate | 7.40% | 7.40%
Projection period | 5 years |
IAS 29 [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Increase in goodwill | € 369 |
Disposal Groups Held for Sale [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Goodwill |  | € 2,228
Indefinite-life intangible assets |  | € 82
Blueair [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Non-cash credit from early settlement of contingent consideration | 277 |
Impairment of intangible asset | € 208 |
Top of range [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Amortisation period of finite-life intangible assets | Ten years |

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