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Expected rate of return (Details 6) - Qualified Plan | Dec. 31, 2019
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Underfunded Plan | Minimum | Equity securities | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, target allocation, percentage | 40.00%
Underfunded Plan | Minimum | Fixed Income Securities | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, target allocation, percentage | 50.00%
Underfunded Plan | Maximum | Equity securities | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, target allocation, percentage | 50.00%
Underfunded Plan | Maximum | Fixed Income Securities | Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, target allocation, percentage | 60.00%
Overfunded Plan | Equity securities | Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, target allocation, percentage | 30.00%
Overfunded Plan | Fixed Income Securities | Other Postretirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, plan assets, target allocation, percentage | 70.00%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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