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Cash and Cash Equivalents - Additional Information (Detail) - EUR (€) € in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 18, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018 | [1]
Detailed information about cash and cash equivalents [line items] |  |  |  |  |  |  |
Cash received on repurchase agreements | € 719 |  | € 719 | € 322 |  |  |
Cash collateral on securities lended | € 2,146 |  | € 2,146 | € 2,480 |  |  |
Weighted effective interest rate on short-term deposits | 0.38% |  | 0.38% | 0.39% |  |  |
Short-term deposits maturity days |  |  | 19 days | 28 days |  |  |
Percentage of deposit with agreed maturity |  |  |  |  |  | 1.00% |
Description of cash flow based on valuation of assets |  |  | This deposit is renewed every 42-49 days, based on an updated valuation of total assets. The interest paid on this deposit is equal to the ECB deposit rate which was -50bp as from 18 September 2019 (-40bp throughout 2018 up to 18 September 2019). |  |  |  |
Interest received on deposit |  |  |  | (0.40%) |  | (0.40%) |
Minimum balance on deposit with Dutch Central Bank | € 79 |  | € 79 | € 70 |  |  |
Effects of changes in exchange rate |  |  | 33 | 35 |  | € (196) |
Consideration paid for acquisitions and investments in associates and joint ventures |  |  | 269 |  |  |  |
Net cash flows from (used in) operating activities |  |  | 7,302 | 517 |  | 553 |
Increase (decrease) in net cash flows from investing activities |  |  | 352 | 758 |  |  |
Net cash flows from (used in) investing activities |  |  | (86) | (438) |  | (1,196) |
Business combination consideration transferred |  |  |  | 89 |  |  |
Transferred cash and cash equivalents amounted to outflow as result of reinsurance transactions and disposal of entities over which control is lost | € 12,263 |  | 12,263 | 8,744 | [1] | 10,768 | € 10,768
Increase (decrease) in net cash flows from financing activities |  |  | 1,312 | (2,914) |  |  |
Net cash flows from (used in) financing activities |  |  | (3,730) | (2,395) |  | 519 |
Increase (decrease) in net cash flows from operating activities |  |  | 6,785 | € (36) |  |  |
On demand [member] |  |  |  |  |  |  |
Detailed information about cash and cash equivalents [line items] |  |  |  |  |  |  |
Interest rate on mandatory reserve deposits | 50.00% | 40.00% |  | 40.00% |  |  |
Disposals [member] |  |  |  |  |  |  |
Detailed information about cash and cash equivalents [line items] |  |  |  |  |  |  |
Consideration received |  |  | 155 | € 214 |  |  |
Consideration received in cash and cash equivalents |  |  |  | 202 |  |  |
Earn-out |  |  |  | 2 |  |  |
Reinsurance transactions and disposal of entities [member] |  |  |  |  |  |  |
Detailed information about cash and cash equivalents [line items] |  |  |  |  |  |  |
Transferred cash and cash equivalents amounted to outflow as result of reinsurance transactions and disposal of entities over which control is lost | € 17 |  | 17 | 416 |  |  |
Securities lending [member] |  |  |  |  |  |  |
Detailed information about cash and cash equivalents [line items] |  |  |  |  |  |  |
Cash received on repurchase agreements | 7,200 |  | 7,200 | 6,200 |  |  |
Cash collateral on securities lended | € 11 |  | 11 | 2 |  |  |
Income from securities lending programs |  |  | € 6 | € 8 |  | € 11 |
[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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