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Financial Risks - Disclosure of Sensitivity Analysis of Shareholders' Equity to Equity Markets (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Equity prices, 10% higher [member] |  |
Disclosure of sensitivity analysis of shareholders' equity to equity markets [line items] |  |
Estimated approximate effects on net income | € 307 | € 293
Estimated approximate effects on shareholders' equity | 450 | 405
Equity prices, 10% lower [member] |  |
Disclosure of sensitivity analysis of shareholders' equity to equity markets [line items] |  |
Estimated approximate effects on net income | (374) | (273)
Estimated approximate effects on shareholders' equity | (525) | (379)
Equity prices, 25% higher [member] |  |
Disclosure of sensitivity analysis of shareholders' equity to equity markets [line items] |  |
Estimated approximate effects on net income | 721 | 789
Estimated approximate effects on shareholders' equity | 1,083 | 1,069
Equity prices, 25% lower [member] |  |
Disclosure of sensitivity analysis of shareholders' equity to equity markets [line items] |  |
Estimated approximate effects on net income | (456) | (308)
Estimated approximate effects on shareholders' equity | € (837) | € (562)

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