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Investments - Summary of Investments in Real Estate (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [abstract]    
Beginning balance € 2,700 € 2,147
Additions 179 472
Subsequent expenditure capitalized 16 3
Disposals (331) (209)
Fair value gains / (losses) 317 261
Net exchange differences 9 27
Other 11 (1)
Ending balance € 2,901 € 2,700