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Financial Risks - Schedule of Sensitivity Analysis of Net Income and Shareholders' Equity (Detail) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Increase by 15% of USD currencies relative to Euro [member] |  |
Disclosure of sensitivity analysis related to translation risk [line items] |  |
Estimated approximate effects on net income | € 203 | € 1
Estimated approximate effects on shareholders' equity | 2,528 | 1,909
Increase by 15% of GBP currencies relative to Euro [member] |  |
Disclosure of sensitivity analysis related to translation risk [line items] |  |
Estimated approximate effects on net income | (11) | 4
Estimated approximate effects on shareholders' equity | 241 | 269
Increase by 15% of non Euro currencies relative to Euro [member] |  |
Disclosure of sensitivity analysis related to translation risk [line items] |  |
Estimated approximate effects on net income | 211 | 20
Estimated approximate effects on shareholders' equity | 2,906 | 2,301
Decrease by 15% of USD currencies relative to Euro [member] |  |
Disclosure of sensitivity analysis related to translation risk [line items] |  |
Estimated approximate effects on net income | (158) | 3
Estimated approximate effects on shareholders' equity | (1,830) | (1,389)
Decrease by 15% of GBP currencies relative to Euro [member] |  |
Disclosure of sensitivity analysis related to translation risk [line items] |  |
Estimated approximate effects on net income | 9 | (2)
Estimated approximate effects on shareholders' equity | (163) | (179)
Decrease by 15% of non Euro currencies relative to Euro [member] |  |
Disclosure of sensitivity analysis related to translation risk [line items] |  |
Estimated approximate effects on net income | (150) | (9)
Estimated approximate effects on shareholders' equity | € (2,094) | € (1,659)

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