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Investment Contracts - Summary of Investment Contracts for Account of Policyholders (Detail) - EUR (€)
€ in Millions
 12 Months Ended
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