XML 62 R41.htm IDEA: XBRL DOCUMENT
v3.22.4

Employee Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Allocation of Plan Assets | The percentages of total plan asset by investment category for our Pension Plan at December 31 were as follows:
Return-seeking Assets |  | 2022 |  | 2021
Equity |  | 14% |  | 15%
Real estate |  | 7% |  | 7%
Fixed income |  | 2% |  | 3%
Hedge funds |  | 3% |  | 3%
Total |  | 26% |  | 28%
Liability-hedging Assets |  | 2022 |  | 2021
Fixed income |  | 72% |  | 71%
Cash |  | 2% |  | 1%
Total |  | 74% |  | 72%
Total Assets |  | 100% |  | 100%
Schedule of Employer Contribution to Employee Benefit Plans | Contributions for the years ended December 31 were as follows (in thousands):
|  | 2022 |  |  | 2021 |
Defined Contribution Plan |  |  |  |  |  |
Company retirement contributions |  | $ | 11,885 |  |  | $ | 11,332 |
Company matching contributions |  | $ | 16,187 |  |  | $ | 15,938 |
|  | 2022 |  |  | 2021 |
Defined Benefit Plans |  |  |  |  |  |
Defined Benefit Pension Plan |  | $ | - |  |  | $ | - |
Non-Pension Defined Benefit Postretirement Healthcare Plan |  | $ | 6,131 |  |  | $ | 6,432 |
Supplemental Non-Qualified Defined Benefit Plans |  | $ | 3,061 |  |  | $ | 2,576 |
Schedule of Changes in Projected Benefit Obligations | The following tables provide a reconciliation of the employee benefit plan obligations and fair value of employee benefit plan assets, amounts recognized in the Consolidated Balance Sheets, accumulated benefit obligation, and reconciliation of components of the net periodic expense and elements of AOCI (in thousands): Employee Benefit Plan Obligations
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
As of December 31, |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 478,262 |  |  | $ | 514,008 |  |  | $ | 55,260 |  |  | $ | 55,054 |  |  | $ | 63,484 |  |  | $ | 70,238 |
Service cost (a) |  |  | 3,927 |  |  |  | 5,038 |  |  |  | (801 | ) |  |  | 3,149 |  |  |  | 1,968 |  |  |  | 2,237 |
Interest cost |  |  | 10,819 |  |  |  | 9,313 |  |  |  | 834 |  |  |  | 706 |  |  |  | 1,285 |  |  |  | 1,058 |
Actuarial (gain) loss |  |  | (97,960 | ) |  |  | (14,037 | ) |  |  | (7,007 | ) |  |  | (1,073 | ) |  |  | (12,300 | ) |  |  | (5,165 | )
Amendments |  |  | - |  |  |  | (561 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Benefits paid |  |  | (36,663 | ) |  |  | (35,499 | ) |  |  | (3,061 | ) |  |  | (2,576 | ) |  |  | (6,131 | ) |  |  | (6,432 | )
Plan participants’ contributions |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,419 |  |  |  | 1,548 |
Projected benefit obligation at end of year |  | $ | 358,385 |  |  | $ | 478,262 |  |  | $ | 45,225 |  |  | $ | 55,260 |  |  | $ | 49,725 |  |  | $ | 63,484 |
Schedule of Changes in Fair Value of Plan Assets |
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan (a) |
As of December 31, |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Change in fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning fair value of plan assets |  | $ | 458,387 |  |  | $ | 473,721 |  |  | $ | - |  |  | $ | - |  |  | $ | 7,972 |  |  | $ | 8,165 |
Investment income (loss) |  |  | (98,585 | ) |  |  | 20,165 |  |  |  | - |  |  |  | - |  |  |  | 4 |  |  |  | (35 | )
Employer contributions |  |  | - |  |  |  | - |  |  |  | 3,061 |  |  |  | 2,576 |  |  |  | 4,488 |  |  |  | 4,726 |
Retiree contributions |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,419 |  |  |  | 1,548 |
Benefits paid |  |  | (36,661 | ) |  |  | (35,499 | ) |  |  | (3,061 | ) |  |  | (2,576 | ) |  |  | (6,131 | ) |  |  | (6,432 | )
Ending fair value of plan assets |  | $ | 323,141 |  |  | $ | 458,387 |  |  | $ | - |  |  | $ | - |  |  | $ | 7,752 |  |  | $ | 7,972 |
(a) Assets of VEBA trusts.
Schedule of Amounts Recognized in Balance Sheet | Amounts Recognized in the Consolidated Balance Sheets
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
As of December 31, |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Regulatory assets |  | $ | 78,654 |  |  | $ | 67,403 |  |  | $ | - |  |  | $ | - |  |  | $ | 3,788 |  |  | $ | 11,660 |
Current liabilities |  | $ | - |  |  | $ | - |  |  | $ | 2,231 |  |  | $ | 2,156 |  |  | $ | 4,427 |  |  | $ | 4,584 |
Non-current assets |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | 959 |  |  | $ | - |
Non-current liabilities |  | $ | 35,243 |  |  | $ | 19,872 |  |  | $ | 42,994 |  |  | $ | 53,104 |  |  | $ | 38,505 |  |  | $ | 50,949 |
Regulatory liabilities |  | $ | 2,804 |  |  | $ | 3,830 |  |  | $ | - |  |  | $ | - |  |  | $ | 6,198 |  |  | $ | 2,447 |
Schedule of Accumulated and Projected Benefit Obligations | Accumulated Benefit Obligation
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
As of December 31, |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Accumulated Benefit Obligation |  | $ | 350,187 |  |  | $ | 466,505 |  |  | $ | 45,225 |  |  | $ | 55,260 |  |  | $ | 49,725 |  |  | $ | 63,484 |
Components of Net Periodic Benefit Cost |
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
For the years ended December 31, |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Service cost |  | $ | 3,927 |  |  | $ | 5,038 |  |  | $ | 5,411 |  |  | $ | (801 | ) |  | $ | 3,149 |  |  | $ | 1,579 |  |  | $ | 1,968 |  |  | $ | 2,237 |  |  | $ | 2,056 |
Interest cost |  |  | 10,819 |  |  |  | 9,313 |  |  |  | 13,426 |  |  |  | 834 |  |  |  | 706 |  |  |  | 1,099 |  |  |  | 1,285 |  |  |  | 1,058 |  |  |  | 1,649 |
Expected return on assets |  |  | (18,523 | ) |  |  | (20,876 | ) |  |  | (22,591 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (125 | ) |  |  | (136 | ) |  |  | (182 | )
Net amortization of prior service cost |  |  | (68 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 2 |  |  |  | (289 | ) |  |  | (434 | ) |  |  | (546 | )
Recognized net actuarial loss (gain) |  |  | 6,092 |  |  |  | 7,315 |  |  |  | 8,372 |  |  |  | 276 |  |  |  | 1,754 |  |  |  | 1,702 |  |  |  | 64 |  |  |  | 466 |  |  |  | 20 |
Net periodic expense |  | $ | 2,247 |  |  | $ | 790 |  |  | $ | 4,618 |  |  | $ | 309 |  |  | $ | 5,609 |  |  | $ | 4,382 |  |  | $ | 2,903 |  |  | $ | 3,191 |  |  | $ | 2,997 |
Schedule of Net Periodic Benefit Cost Not yet Recognized |
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
As of December 31, |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Net (gain) loss |  | $ | 5,179 |  |  | $ | 4,398 |  |  | $ | 1,565 |  |  | $ | 7,159 |  |  | $ | (667 | ) |  | $ | (308 | )
Prior service cost (gain) |  |  | (39 | ) |  |  | (46 | ) |  |  | - |  |  |  | - |  |  |  | 74 |  |  |  | (27 | )
Total amounts included in AOCI, after-tax not yet recognized as components of net periodic expense |  | $ | 5,140 |  |  | $ | 4,352 |  |  | $ | 1,565 |  |  | $ | 7,159 |  |  | $ | (593 | ) |  | $ | (335 | )
Schedule of Assumptions Used | Assumptions
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
Weighted-average assumptions used to determine benefit obligations: |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Discount rate |  |  | 5.17 | % |  |  | 2.88 | % |  |  | 2.56 | % |  |  | 5.13 | % |  |  | 2.77 | % |  |  | 2.41 | % |  |  | 5.14 | % |  |  | 2.79 | % |  |  | 2.41 | %
Rate of increase in compensation levels |  |  | 3.06 | % |  |  | 3.08 | % |  |  | 3.34 | % |  |  | — |  |  |  | 5.00 | % |  |  | 5.00 | % |  | N/A |  |  | N/A |  |  | N/A |
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
Weighted-average assumptions used to determine net periodic benefit cost for plan year: |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |  |  | 2022 |  |  | 2021 |  |  | 2020 |
Discount rate (a) |  |  | 2.88 | % |  |  | 2.56 | % |  |  | 3.27 | % |  |  | 2.77 | % |  |  | 2.41 | % |  |  | 3.14 | % |  |  | 2.79 | % |  |  | 2.41 | % |  |  | 3.15 | %
Expected long-term rate of return on assets (b) |  |  | 4.25 | % |  |  | 4.50 | % |  |  | 5.25 | % |  | N/A |  |  | N/A |  |  | N/A |  |  |  | 1.70 | % |  |  | 1.80 | % |  |  | 2.35 | %
Rate of increase in compensation levels |  |  | 3.08 | % |  |  | 3.34 | % |  |  | 3.49 | % |  |  | — |  |  |  | 5.00 | % |  |  | 5.00 | % |  | N/A |  |  | N/A |  |  | N/A |
(a) The estimated discount rate for the Defined Benefit Pension Plan is 5.2% for the calculation of the 2023 net periodic pension costs. (b) The expected rate of return on plan assets for the Defined Benefit Pension Plan is 6.0% for the calculation of the 2023 net periodic pension cost.
Schedule of Health Care Cost Trend Rates | The healthcare benefit obligation at December 31 was determined as follows:
|  | 2022 |  |  | 2021 |
Trend Rate - Medical |  |  |  |  |  |
Pre-65 for next year - All Plans |  |  | 7.00 | % |  |  | 6.05 | %
Pre-65 Ultimate trend rate - Black Hills Corp |  |  | 4.50 | % |  |  | 4.50 | %
Trend Year |  | 2031 |  |  | 2030 |
Post-65 for next year - All Plans |  |  | 6.00 | % |  |  | 5.10 | %
Post-65 Ultimate trend rate - Black Hills Corp |  |  | 4.50 | % |  |  | 4.50 | %
Trend Year |  | 2031 |  |  | 2030 |
Schedule of Expected Benefit Payments | The following benefit payments to employees, which reflect future service, are expected to be paid (in thousands):
|  | Defined Benefit Pension Plan |  |  | Supplemental Non-qualified Defined Benefit Plans |  |  | Non-pension Defined Benefit Postretirement Healthcare Plan |
2023 |  | $ | 26,889 |  |  | $ | 2,231 |  |  | $ | 5,600 |
2024 |  | $ | 26,882 |  |  | $ | 2,417 |  |  | $ | 5,313 |
2025 |  | $ | 27,870 |  |  | $ | 2,764 |  |  | $ | 5,022 |
2026 |  | $ | 28,182 |  |  | $ | 2,790 |  |  | $ | 4,883 |
2027 |  | $ | 28,166 |  |  | $ | 2,727 |  |  | $ | 4,769 |
2028 -2032 |  | $ | 140,416 |  |  | $ | 12,184 |  |  | $ | 21,147 |
Pension Plan |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Allocation of Plan Assets | The following tables set forth, by level within the fair value hierarchy, the assets that were accounted for at fair value on a recurring basis (in thousands):
Pension Plan |  | December 31, 2022 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total Investments Measured at Fair Value |  |  | NAV (a) |  |  | Total Investments |
Common Collective Trust - Cash and Cash Equivalents |  | $ | - |  |  | $ | 6,374 |  |  | $ | - |  |  | $ | 6,374 |  |  | $ | - |  |  | $ | 6,374 |
Common Collective Trust - Equity |  |  | - |  |  |  | 45,087 |  |  |  | - |  |  |  | 45,087 |  |  |  | - |  |  |  | 45,087 |
Common Collective Trust - Fixed Income |  |  | - |  |  |  | 242,025 |  |  |  | - |  |  |  | 242,025 |  |  |  | - |  |  |  | 242,025 |
Common Collective Trust - Real Estate |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 21,572 |  |  |  | 21,572 |
Hedge Funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 8,084 |  |  |  | 8,084 |
Total investments measured at fair value |  | $ | - |  |  | $ | 293,486 |  |  | $ | - |  |  | $ | 293,486 |  |  | $ | 29,656 |  |  | $ | 323,142 |
Pension Plan |  | December 31, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total Investments Measured at Fair Value |  |  | NAV (a) |  |  | Total Investments |
Common Collective Trust - Cash and Cash Equivalents |  | $ | - |  |  | $ | 6,009 |  |  | $ | - |  |  | $ | 6,009 |  |  | $ | - |  |  | $ | 6,009 |
Common Collective Trust - Equity |  |  | - |  |  |  | 70,262 |  |  |  | - |  |  |  | 70,262 |  |  |  | - |  |  |  | 70,262 |
Common Collective Trust - Fixed Income |  |  | - |  |  |  | 339,219 |  |  |  | - |  |  |  | 339,219 |  |  |  | - |  |  |  | 339,219 |
Common Collective Trust - Real Estate |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 30,407 |  |  |  | 30,407 |
Hedge Funds |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 12,490 |  |  |  | 12,490 |
Total investments measured at fair value |  | $ | - |  |  | $ | 415,490 |  |  | $ | - |  |  | $ | 415,490 |  |  | $ | 42,897 |  |  | $ | 458,387 |
(a) Certain investments that are measured at fair value using NAV per share (or its equivalent) for practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in these tables for these investments are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the reconciliation of changes in the plan’s benefit obligations and fair value of plan assets above.
Postretirement Health Coverage |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Allocation of Plan Assets |
Non-pension Defined Benefit Postretirement Healthcare Plan |  | December 31, 2022 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total Investments Measured at Fair Value |  |  | Total Investments |
Cash and Cash Equivalents |  | $ | 7,752 |  |  | $ | - |  |  | $ | - |  |  | $ | 7,752 |  |  | $ | 7,752 |
Total investments measured at fair value |  | $ | 7,752 |  |  | $ | - |  |  | $ | - |  |  | $ | 7,752 |  |  | $ | 7,752 |
Non-pension Defined Benefit Postretirement Healthcare Plan |  | December 31, 2021 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total Investments Measured at Fair Value |  |  | Total Investments |
Cash and Cash Equivalents |  | $ | 7,972 |  |  | $ | - |  |  | $ | - |  |  | $ | 7,972 |  |  | $ | 7,972 |
Total investments measured at fair value |  | $ | 7,972 |  |  | $ | - |  |  | $ | - |  |  | $ | 7,972 |  |  | $ | 7,972 |

X
- Definition Schedule of Employer Contribution to Defined Benefit and Defined Contribution Plans [Table Text Block] + References No definition available. + Details
Name: | bkh_ScheduleOfEmployerContributionToEmployeeBenefitPlansTableTextBlock
Namespace Prefix: | bkh_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefit obligations including accumulated benefit obligation and projected benefit obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAccumulatedAndProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAssumptionsUsedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfChangesInProjectedBenefitObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfHealthCareCostTrendRatesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetPeriodicBenefitCostNotYetRecognizedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |