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Cash and Cash Equivalents - Summary of Reconciliation of Liabilities Arising from Financing Activities (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance | [1] | € 12,061 |  |
Ending balance |  | 9,307 | € 12,061 | [1]
Subordinated borrowings - held at amortized cost [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 1,389 |  |
Net exchange difference |  | 11 | 52 |
Ending balance |  | 2,207 | 1,389 |
Trust pass-through securities - held at amortized cost [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 133 |  |
Net exchange difference |  | 2 | 6 |
Ending balance |  | 136 | 133 |
Borrowings [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 12,061 |  |
Net exchange difference |  | 149 | 263 |
Ending balance |  | 9,307 | 12,061 |
Assets held to hedge Trust pass through securities [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 10 |  |
Net exchange difference |  | 0 | 1 |
Ending balance |  | 11 | 10 |
Cash flow hedges [member] | Subordinated borrowings - held at amortized cost [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 1,389 | 764 |
Addition |  | 806 | 640 |
Repayment |  | 0 | 0 |
Disposal of a business |  |  | 0 |
Realized gains / losses in income statement |  | 0 | 0 |
Movements related to fair value hedges |  | 0 | 0 |
Amortization |  | 1 | 2 |
Transfer to/from other headings |  |  | (68) |
Other |  | 0 | 0 |
Ending balance |  |  | 1,389 |
Cash flow hedges [member] | Trust pass-through securities - held at amortized cost [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 133 | 133 |
Addition |  | 0 | 0 |
Repayment |  | 0 | 0 |
Disposal of a business |  |  | 0 |
Realized gains / losses in income statement |  | 0 | 0 |
Movements related to fair value hedges |  | 1 | (6) |
Amortization |  | (1) | 0 |
Transfer to/from other headings |  |  | 0 |
Other |  | 0 | 0 |
Ending balance |  |  | 133 |
Cash flow hedges [member] | Borrowings [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 12,061 | 13,635 |
Addition |  | 4,117 | 3,545 |
Repayment |  | (7,014) | (5,211) |
Disposal of a business |  |  | (151) |
Realized gains / losses in income statement |  | (8) | (23) |
Movements related to fair value hedges |  | 0 | 0 |
Amortization |  | 1 | 2 |
Transfer to/from other headings |  |  | 0 |
Other |  | 0 | 0 |
Ending balance |  |  | 12,061 |
Cash flow hedges [member] | Assets held to hedge Trust pass through securities [member] |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance |  | 10 | 15 |
Addition |  | 0 | 0 |
Repayment |  | 0 | 0 |
Disposal of a business |  |  | 0 |
Realized gains / losses in income statement |  | 1 | (6) |
Movements related to fair value hedges |  | 0 | 0 |
Amortization |  | 0 | 0 |
Transfer to/from other headings |  |  | 0 |
Other |  | € 0 | 0 |
Ending balance |  |  | € 10 |
[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 for details about this change.

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