Employee benefits - Actuarial assumptions - Impacts on pension benefit obligations (Details) € in Millions	Dec. 31, 2019 EUR (€)
Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [abstract]
Rate increase (as a percent)	0.50%
Rate decrease (as a percent)	0.50%
Increase (decrease) in benefit obligation, increase in assumption	€ (113)
Increase (decrease) in benefit obligation, decrease in assumption	€ 124
Sign-up rate for French part-time seniors plans, actuarial assumptions [member]
Disclosure of sensitivity analysis for actuarial assumptions [abstract]
Rate increase (as a percent)	5.00%
Rate decrease (as a percent)	5.00%
Increase (decrease) in benefit obligation, increase in assumption	€ (42)
Increase (decrease) in benefit obligation, decrease in assumption	€ 42

No definition available.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

+ Details

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- Definition

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

+ References

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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]]

+ References

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