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Segment Information - Additional Information (Detail) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 EUR (€) | Dec. 31, 2019 EUR (€) Segment | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€)
Disclosure of operating segments [line items] |  |  |  |
Impact of net income due to measurement assumption |  | € 0 |  |
Other income /(charges) expense due to model and assumption updates |  | (196) | € (121) |
Losses on change in fair value on economic hedges |  | 1,130 | (545) | € (1,159)
Ineffectiveness fair value hedge |  | 1 | 7 | 2
Impairment charges and reversals on financial assets, excluding receivables |  | 60 | 41 | 42
Impairment charges and reversals on non-financial assets and receivables |  | 109 | 36 |
Commissions and expenses [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Restructuring charges |  | 220 | 279 | 116
Amortization of deferred expenses |  |  | 67 | 285
Amortization of VOBA and future servicing rights |  | 5 | 20 | 94
Commissions and expense include a DPAC/VOBA fair value adjustment |  | 151 | (88) | 135
Impairment (charges) reversals [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Amortization of deferred expenses |  | 32 |  |
Impairment charges and reversals on financial assets, excluding receivables |  | 60 | 41 | 42
Impairment charges and reversals on non-financial assets and receivables |  | € 109 | 19 | (1)
Americas Expenses [Member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Other income /(charges) expense due to model and assumption updates | € (75) |  |  |
Bottom of range [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Long-term expected return on assets rate |  | 3.00% |  |
Top of range [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Long-term expected return on assets rate |  | 10.00% |  |
Non-cash changes [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Gain (losses) on over- or underperformance of derivatives |  | € 34 | 3 | 9
Losses on change in fair value on economic hedges |  | 130 | (77) | (145)
Ineffectiveness fair value hedge |  | € 1 | 7 | € 2
Asset management [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Number of operating segments | Segment |  | 1 |  |
Holding and other activities [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Number of operating segments | Segment |  | 1 |  |
Americas [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Number of operating segments | Segment |  | 1 |  |
Other income /(charges) expense due to model and assumption updates |  | € (64) | (6) |
Americas [member] | Americas Life mortality [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Other income /(charges) expense due to model and assumption updates |  |  | (164) |
Americas [member] | New expense allocation methodology [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Other income /(charges) expense due to model and assumption updates |  |  | (158) |
Asia [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Number of operating segments | Segment |  | 1 |  |
The Netherlands [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Other income /(charges) expense due to model and assumption updates |  | € (57) | (111) |
The Netherlands [member] | Population mortality [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Other income /(charges) expense due to model and assumption updates |  |  | (219) |
The Netherlands [member] | TKP UL Model [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Other income /(charges) expense due to model and assumption updates |  |  | € (108) |
The Netherlands [member] | Bottom of range [member] | Population mortality [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Lowering of IFRS ultimate forward rate |  |  | 3.65% |
The Netherlands [member] | Top of range [member] | Population mortality [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Lowering of IFRS ultimate forward rate |  |  | 4.25% |

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