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Investment Contracts - Summary of Investment Contracts for Account of Policyholders (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of investment contracts for account of policyholder [Line Items] |  |
Beginning balance | € 80,097 | € 74,434
Additions |  | 18,415
Gross premium and deposits - existing and new business | 11,610 | 7,711
Withdrawals | (10,228) | (10,279)
Interest credited | 14,755 | (4,157)
Investment contracts liabilities released | (4,815) | (6,506)
Fund charges released | (142) | (157)
Net exchange differences | 3,755 | 772
Transfer to/from other headings | (1,210) | (137)
Other | 1 | 2
Ending balance | 93,826 | 80,097
Without Discretionary Participation Features [member] |  |
Disclosure of investment contracts for account of policyholder [Line Items] |  |
Beginning balance | 49,847 | 37,169
Additions |  | 18,415
Gross premium and deposits - existing and new business | 10,545 | 6,432
Withdrawals | (10,228) | (10,279)
Interest credited | 9,244 | (2,682)
Fund charges released | (142) | (157)
Net exchange differences | 1,898 | 1,084
Transfer to/from other headings | (1,210) | (137)
Other | 1 | 2
Ending balance | 59,956 | 49,847
With Discretionary Participation Features [member] |  |
Disclosure of investment contracts for account of policyholder [Line Items] |  |
Beginning balance | 30,250 | 37,265
Gross premium and deposits - existing and new business | 1,066 | 1,279
Interest credited | 5,511 | (1,475)
Investment contracts liabilities released | (4,815) | (6,506)
Net exchange differences | 1,858 | (312)
Ending balance | € 33,870 | € 30,250

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