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Shares in group companies (Tables)
12 Months Ended
Dec. 31, 2018
Aegon N.V [member]  
Statement [LineItems]  
Summary of Shares in Group Companies
                            2018                           2017  

At January 1

     23,117       22,219  

Capital contributions and acquisitions

     97       1,006  

Divestments and capital repayments

     (23     (698

Dividend received

     (702     (120

Net income/(loss) for the financial year

     831       2,511  

Revaluations

     (1,154     (1,799

At December 31

     22,168       23,117