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Acquisitions and Disposals - Summary of Effect of Acquisitions on Consolidated Balance Sheet (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Detailed Information about Business Combination [Line Items] |  |  |
Net assets acquired | € 815 | € 2,423 | € 929
Non-controlling interest | (17) | (50) |
Goodwill | 17,341 | 16,881 |
Total payment for acquisition | 1,294 | 4,912 | 2,069
Exchange rate gain/ (loss) on cash flow hedge | (100) | 51 | 14
Total consideration | 1,194 | 4,963 | 2,083
Subsidiaries [member] |  |  |
Disclosure of Detailed Information about Business Combination [Line Items] |  |  |
Goodwill | € 496 | € 2,539 | € 1,140

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