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Financial Risks - Schedule of Sensitivity Analysis of Net Income and Shareholders' Equity (Detail) - EUR (€) € in Millions	12 Months Ended
	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)