The life expectancy after retirement used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

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The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

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- Definition

The amount of employer contributions to retirement benefit plans.

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The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

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The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

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Post-employment benefits - Text Details (Detail) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 EUR (€)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 EUR (€)	Dec. 31, 2016 EUR (€)
Post-employment benefits - Text Details (Detail) [Line Items]
Weighted average duration of defined benefit obligation		11	11	12
Percentage of unquoted assets		33.00%	33.00%	37.00%
Percentage of reasonably possible increase in actuarial assumption		1.00%	1.00%
Actuarial assumption of mortality rates		0.10	0.10
Cash outflow	€ 402
Employer contributions	20
Post-employment benefit expense, defined benefit plans	31	€ 46		€ 95	€ 58
Interest expense (income), net defined benefit liability (asset)		23		37	48
Included in financial expense [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Post-employment benefit expense, defined benefit plans		€ 23		€ 37	€ 48
Interest expense (income), net defined benefit liability (asset)	22
Bottom of range [member]
Post-employment benefits - Text Details (Detail) [Line Items]
Actuarial assumption of life expectancy after retirement		0.5	0.5
Top of range [member]
Post-employment benefits - Text Details (Detail) [Line Items]
Actuarial assumption of life expectancy after retirement		1	1
Germany [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Employer contributions	13
Other countries [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Employer contributions	7
United States of America [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
De-risking contributions paid into pension plan		€ 130	$ 150
Employer contributions	0
US and Germany [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Percentage of total DBO that relate to the largest DB plans in these countries		88.00%	88.00%
Defined contribution plans [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Employer contributions	340
Defined contribution plans [Member] \| Netherlands [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Employer contributions	168
Defined contribution plans [Member] \| Other countries [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Employer contributions	54
Defined contribution plans [Member] \| United States of America [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Employer contributions	118
Unfunded defined-benefit plans [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Cash outflow	42
Unfunded defined-benefit plans [Member] \| Germany [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Cash outflow	19
Unfunded defined-benefit plans [Member] \| Other countries [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Cash outflow	13
Unfunded defined-benefit plans [Member] \| United States of America [Member]
Post-employment benefits - Text Details (Detail) [Line Items]
Cash outflow	€ 10