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Provisions for employee benefits (Details 7) € in Millions | Dec. 31, 2018 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 EUR (€)
--- | --- | --- | ---
Actuarial assumption of discount rates [member] |  |  |
Statement [Line Items] |  |  |
Percentage of reasonably possible decrease in actuarial assumption | 50.00% | 50.00% |
Actuarial assumption of discount rates [member] | Italian defined benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | € (12) |  | € (13)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 13 |  | 14
Actuarial assumption of discount rates [member] | Foreign defined benefit plan [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (58) |  | (72)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 65 |  | 79
Actuarial assumption of discount rates [member] | FISDE and other foreign medical plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (7) |  | (7)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 8 |  | 7
Actuarial assumption of discount rates [member] | Other benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (5) |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 3 |  |
Increase Decrease In other Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption |  |  | (3)
Increase Decrease In other Benefit Obligation Due To Reasonably Possible Decrease In Actuarial Assumption |  |  | 1
Actuarial assumption of expected rates of inflation [member] | Italian defined benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 8 |  | 9
Actuarial assumption of expected rates of inflation [member] | Foreign defined benefit plan [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 23 |  | 24
Actuarial assumption of expected rates of inflation [member] | FISDE and other foreign medical plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of expected rates of inflation [member] | Other benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 1 |  |
Increase Decrease In other Benefit Obligation Due To Reasonably Possible Increase In Actuarial Assumption |  |  | 1
Actuarial assumption of expected rates of salary increases [member] | Italian defined benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of expected rates of salary increases [member] | Foreign defined benefit plan [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 15 |  | 20
Actuarial assumption of expected rates of salary increases [member] | FISDE and other foreign medical plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of expected rates of salary increases [member] | Other benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of medical cost trend rates [member] | Italian defined benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of medical cost trend rates [member] | Foreign defined benefit plan [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of medical cost trend rates [member] | FISDE and other foreign medical plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 6 |  | 7
Actuarial assumption of medical cost trend rates [member] | Other benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of expected rates of pension increases [member] | Italian defined benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of expected rates of pension increases [member] | Foreign defined benefit plan [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | € 18 |  | € 13
Actuarial assumption of expected rates of pension increases [member] | FISDE and other foreign medical plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |
Actuarial assumption of expected rates of pension increases [member] | Other benefit plans [Member] |  |  |
Statement [Line Items] |  |  |
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ |  |  |

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