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Expected rate of return (Details 6) | 12 Months Ended
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Dec. 31, 2016
Equity securities [Member] | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target plan asset allocations range maximum | 50.00%
Defined benefit plan, target plan asset allocations range minimum | 40.00%
Equity securities [Member] | Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target plan asset allocations range maximum | 40.00%
Defined benefit plan, target plan asset allocations range minimum | 30.00%
Fixed Income Securities [Member] | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target plan asset allocations range maximum | 60.00%
Defined benefit plan, target plan asset allocations range minimum | 50.00%
Fixed Income Securities [Member] | Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, target plan asset allocations range maximum | 70.00%
Defined benefit plan, target plan asset allocations range minimum | 60.00%

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