Defined Benefit Plans - Summary of Breakdown of Plan Assets for Retirement of Benefit Plans (Detail) - EUR (€) € in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of fair value of plan assets [Line Items]
Debt instrument	€ 490	€ 990
Real estate		142
Derivatives	(218)	(3)
Investment funds	2,214	3,069
Structured securities	268
Other	328	518
At December 31	€ 3,083	€ 4,717
Equity instruments	0.00%	0.00%
Debt instrument	16.00%	21.00%
Real estate	0.00%	3.00%
Derivatives	(7.00%)	0.00%
Investment funds	72.00%	65.00%
Structured securities	9.00%	0.00%
Other	11.00%	11.00%
At December 31	100.00%	100.00%
Quoted Plan Assets [member]
Disclosure of fair value of plan assets [Line Items]
Debt instrument	€ 336	€ 603
Other		2
At December 31	336	605
Unquoted plan assets [member]
Disclosure of fair value of plan assets [Line Items]
Debt instrument	154	387
Real estate		142
Derivatives	(218)	(3)
Investment funds	2,214	3,069
Structured securities	268
Other	328	516
At December 31	€ 2,746	€ 4,112

Percentage Contributed To Fair Value Of Plan Assets

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The amount of assets held by retirement benefit plans. [Refer: Defined benefit plans [member]]

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The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The percentage instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Debt instruments, amount contributed to fair value of plan assets]

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The amount derivatives contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Derivatives [member]]

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The percentage derivatives contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Derivatives, amount contributed to fair value of plan assets]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Equity instruments, amount contributed to fair value of plan assets]

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The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]]

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The percentage investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]] [Contrast: Investment funds, amount contributed to fair value of plan assets]

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The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The percentage other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Other assets, amount contributed to fair value of plan assets]

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The amount real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The percentage real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Real estate, amount contributed to fair value of plan assets]

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The amount debt that has been structured to meet a particular investment objective contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The percentage debt that has been structured to meet a particular investment objective contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Structured debt, amount contributed to fair value of plan assets]

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