Defined Benefit Plans - Summary of Breakdown of Plan Assets for Retirement of Benefit Plans (Detail) - EUR (€) € in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of fair value of plan assets [Line Items]
Debt instrument	€ 601	€ 490
Derivatives	(143)	(218)
Investment funds	2,142	2,214
Structured securities	200	268
Other	252	328
On December 31	€ 3,051	€ 3,083
Debt instrument	20.00%	16.00%
Derivatives	(5.00%)	(7.00%)
Investment funds	70.00%	72.00%
Structured securities	7.00%	9.00%
Other	8.00%	11.00%
On December 31	100.00%	100.00%
Quoted Plan Assets [member]
Disclosure of fair value of plan assets [Line Items]
Debt instrument	€ 424	€ 336
On December 31	424	336
Unquoted plan assets [member]
Disclosure of fair value of plan assets [Line Items]
Debt instrument	177	154
Derivatives	(143)	(218)
Investment funds	2,142	2,214
Structured securities	200	268
Other	252	328
On December 31	€ 2,627	€ 2,746

Percentage Contributed To Fair Value Of Plan Assets

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- Definition

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

+ References

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- Definition

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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- Definition

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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- Definition

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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- Definition

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.

+ References

No definition available.

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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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- Definition

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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- Definition

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]

+ References

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- Definition

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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- Definition

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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