Pensions and other post-employment benefits - Sensitivity analysis (Details) - United States € in Millions	Dec. 31, 2017 EUR (€) item
Discount rate for determining present values
Sensitivity analysis
Increase in assumption (as a percent)	1.00%
Decrease in assumption (as a percent)	1.00%
Increase in assumption	€ 2,441
Decrease in assumption	€ (2,961)
Annual rate of increase in future compensation levels
Sensitivity analysis
Increase in assumption (as a percent)	1.00%
Decrease in assumption (as a percent)	1.00%
Increase in assumption	€ (117)
Decrease in assumption	€ 103
Pension growth rate
Sensitivity analysis
Increase in assumption (as a percent)	1.00%
Decrease in assumption (as a percent)	1.00%
Increase in assumption	€ (557)
Decrease in assumption	€ 468
Inflation rate
Sensitivity analysis
Increase in assumption (as a percent)	1.00%
Decrease in assumption (as a percent)	1.00%
Increase in assumption	€ (533)
Decrease in assumption	€ 437
Healthcare cost trend rate
Sensitivity analysis
Increase in assumption (as a percent)	1.00%
Decrease in assumption (as a percent)	1.00%
Increase in assumption	€ (47)
Decrease in assumption	43
Life expectancy
Sensitivity analysis
Increase in assumption	(899)
Decrease in assumption	€ 846
Change in life expectancy assumption \| item	1

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]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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]]

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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]]

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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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