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PENSIONS AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS - Sensitivity Analysis on Defined Benefit Obligations (Details) - Actuarial assumption of discount rates € in Millions	Dec. 31, 2020 EUR (€)
Disclosure of sensitivity analysis for actuarial assumptions [line items]
50 bp increase in discount rates	€ (79)
50 bp decrease in discount rates	82
France
Disclosure of sensitivity analysis for actuarial assumptions [line items]
50 bp increase in discount rates	(11)
50 bp decrease in discount rates	11
Germany
Disclosure of sensitivity analysis for actuarial assumptions [line items]
50 bp increase in discount rates	(9)
50 bp decrease in discount rates	10
Switzerland
Disclosure of sensitivity analysis for actuarial assumptions [line items]
50 bp increase in discount rates	(26)
50 bp decrease in discount rates	28
United States
Disclosure of sensitivity analysis for actuarial assumptions [line items]
50 bp increase in discount rates	(33)
50 bp decrease in discount rates	€ 33

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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]]

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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]]

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