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Income Taxes - Summary of Reconciliation Between Standard and Effective Income Tax (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation between standard and effective income tax: |  |  |
Income before tax | € 1,457 | € 751 | € 2,534
Income tax calculated using weighted average applicable statutory tax rates | 293 | 178 | 745
Difference due to the effects of: |  |  |
Non-taxable income | (76) | (80) | (157)
Non-tax deductible expenses | 22 | 28 | 28
Changes in tax rate/base | 33 | (30) | (550)
Different tax rates on overseas earnings | (1) |  | (1)
Tax credits | (67) | (68) | (67)
Other taxes | 57 | 29 | 67
Adjustments to prior years | (22) | 11 | 2
Origination and change in contingencies | 0 | 2 | 9
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
Tax effect of (profit) / losses from joint ventures and associates | (11) | (9) | (7)
Other | (31) | (3) | (1)
Difference due to effects of income tax | (76) | (138) | (680)
Income tax for the period (income) / charge | € 218 | € 40 | € 65

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