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Income Taxes - Summary of the Components of Income Tax for Period (Income) / Charge (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current tax |  |  |
Current year | € 118 | € 54 | € 220
Adjustments to prior years | (14) | (36) | 47
Current tax | 104 | 18 | 267
Deferred tax |  |  |
Origination / (reversal) of temporary differences | 69 | 23 | 397
Changes in tax rates / bases | 33 | (30) | (550)
Changes in deferred tax assets as a result of recognition / write off of previously not recognized / recognized tax losses, tax credits and deductible temporary differences | 4 | (35) | (45)
Non-recognition of deferred tax assets | 17 | 17 | 41
Reconciliation between standard and effective tax |  |  |
Income before tax | 1,457 | 751 | 2,534
Differences due to the effect of: |  |  |
Non deductible expenses | (22) | (28) | (28)
Adjustments prior year | (8) | 48 | (45)
Deferred tax | 114 | 22 | (201)
Income tax for the period (income) / charge | 218 | 40 | € 65
Aegon N.V [member] |  |  |
Current tax |  |  |
Current year | 40 | 2 |
Current tax | 40 | 2 |
Reconciliation between standard and effective tax |  |  |
Income before tax | (181) | (124) |
Tax on income on Dutch corporate income tax rate | 45 | 31 |
Differences due to the effect of: |  |  |
Non deductible expenses | (6) | (5) |
Adjustments prior year |  | (24) |
Income tax for the period (income) / charge | € 40 | € 2 |

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- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2019-01-01 -Paragraph 80 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_80_b&doctype=Standard -URIDate 2019-03-27 + Details
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