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Loans to Group Companies - Summary of Loans to Group Companies (Detail) - Aegon N.V [member] - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Loans to Subsidiaries Joint Ventures and Associates [Line items]    
Beginning balance € 2,487 [1] € 2,690
Additions / (repayments) (1,194) (333)
Other changes 45 131
Ending balance 1,337 2,487 [1]
Current 957 2,427
Non-current € 380 € 60
[1] Amounts have been restated to reflect voluntary changes in accounting policies related to liability adequacy testing that was adopted by Aegon effective January 1, 2019. Refer to note 2.1.2 Voluntary changes in accounting policies in the consolidated notes for details about this change.