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Five-Year Schedule of Maturities of Debt (Detail) - EUR (€) € in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | [1]
--- | --- | --- | --- | ---
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings | € 2,207 | € 1,389 | [1] | € 764
Long-term borrowings | 4,338 | 10,682 |  |
Aegon N.V [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings | 1,403 | 1,389 | [2] |
Long-term borrowings | 1,257 | 1,292 | [2] |
Aegon N.V [member] | Not later than 1 year [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings |  |  |  |
Long-term borrowings |  | 78 |  |
Aegon N.V [member] | 12-24 months [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings |  |  |  |
Long-term borrowings |  |  |  |
Aegon N.V [member] | Later than two years and not later than three years [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings |  |  |  |
Long-term borrowings |  |  |  |
Aegon N.V [member] | Later than three years and not later than four years [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings |  |  |  |
Long-term borrowings | 497 |  |  |
Aegon N.V [member] | Later than four years and not later than five years [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings |  |  |  |
Long-term borrowings |  | 496 |  |
Aegon N.V [member] | Later than 5 years [member] |  |  |  |
Disclosure of long-term borrowings [Line Items] |  |  |  |
Subordinated borrowings | 1,403 | 1,389 |  |
Long-term borrowings | € 760 | € 717 |  |
[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.
[2] | 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.

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