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Financial Risks - Summary of Unrealized Gains and Losses on Share Positions (Detail) - Share [member] - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of unrealized gains and losses on share positions [line items] |  |
Cost basis | € 290 | € 371
Carrying value | 312 | 391
Net unrealized gains / (losses) | 23 | (20)
Carrying value of securities with gross unrealized gains | 254 | 304
Gross unrealized gains | 47 | 40
Carrying value of securities with gross unrealized losses | 58 | 86
Gross unrealized losses | € (24) | € (20)

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