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Income taxes - Income tax expense (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income taxes - Text Details (Detail) [Line Items]      
Income before taxes continuing operations [1] € 1,505 € 1,381 € 1,023
Current tax expense (income) and adjustments for current tax of prior periods (314) (272) (145)
Deferred tax expense (income) recognised in profit or loss 121 (77) (58)
Tax expense (income), continuing operations 193 349 203
Foreign countries [member]      
Income taxes - Text Details (Detail) [Line Items]      
Income before taxes continuing operations 869 451 886
Current tax expense (income) and adjustments for current tax of prior periods (289) (258) (155)
Deferred tax expense (income) recognised in profit or loss 105 73 37
Tax expense (income), continuing operations 184 184 118
Netherlands [Member]      
Income taxes - Text Details (Detail) [Line Items]      
Income before taxes continuing operations 636 929 137
Current tax expense (income) and adjustments for current tax of prior periods (25) (15) 10
Deferred tax expense (income) recognised in profit or loss 16 (150) (95)
Tax expense (income), continuing operations € 9 € 165 € 85
[1] Income before tax excludes the result of investments in associates.