Pensions and other post-employment benefits - Contributions (Details) € in Millions	12 Months Ended
Dec. 31, 2017 EUR (€)
United States Pension benefits
Benefits
Contributions	€ 0
Percentage of total healthcare obligations for capped employees	53.00%
Pension Non-qualified plans \| Within 1 year
Benefits
Estimated future contributions	€ 25
Pension Non-qualified plans \| 2018
Benefits
Estimated future contributions	25
Pension Non-qualified plans \| 2019
Benefits
Estimated future contributions	24
Pension Non-qualified plans \| 2020
Benefits
Estimated future contributions	24
Pension Non-qualified plans \| 4 to 5 years
Benefits
Estimated future contributions	23
Pension Non-qualified plans \| 2022-2026
Benefits
Estimated future contributions	110
Pension Non-represented \| Within 1 year
Benefits
Estimated future contributions	9
Pension Non-represented \| 2018
Benefits
Estimated future contributions	9
Pension Non-represented \| 2019
Benefits
Estimated future contributions	9
Pension Non-represented \| 2020
Benefits
Estimated future contributions	9
Pension Non-represented \| 4 to 5 years
Benefits
Estimated future contributions	8
Pension Non-represented \| 2022-2026
Benefits
Estimated future contributions	35
Post-retirement other benefit plans \| Within 1 year
Benefits
Estimated future contributions	3
Post-retirement other benefit plans \| 2018
Benefits
Estimated future contributions	3
Post-retirement other benefit plans \| 2019
Benefits
Estimated future contributions	3
Post-retirement other benefit plans \| 2020
Benefits
Estimated future contributions	3
Post-retirement other benefit plans \| 4 to 5 years
Benefits
Estimated future contributions	3
Post-retirement other benefit plans \| 2022-2026
Benefits
Estimated future contributions	233
Post-retirement Medicare subsidy for formerly union represented \| Within 1 year
Benefits
Estimated future contributions	(16)
Post-retirement Medicare subsidy for formerly union represented \| 2018
Benefits
Estimated future contributions	(15)
Post-retirement Medicare subsidy for formerly union represented \| 2019
Benefits
Estimated future contributions	(14)
Post-retirement Medicare subsidy for formerly union represented \| 2020
Benefits
Estimated future contributions	(14)
Post-retirement Medicare subsidy for formerly union represented \| 4 to 5 years
Benefits
Estimated future contributions	(13)
Post-retirement Medicare subsidy for formerly union represented \| 2022-2026
Benefits
Estimated future contributions	€ (57)

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No definition available.

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- Definition

The amount of employer contributions to retirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 26
-IssueDate 2017-01-01
-Paragraph 35
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_b_i&doctype=Standard
-URIDate 2017-03-09

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- Definition

The estimated amount, at the balance sheet date, of the future benefit contributions (net of subsidy) to be made during the specified period from defined benefit plans.

+ References

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- Definition

The percentage of total retiree healthcare benefit obligation related to capped retiree employees.

+ References

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