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Pension Benefits - Weighted Average Asset Allocation for Pension Plans (Details) - Pension Plans, Defined Benefit	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	100.00%	100.00%
Corporate Bonds and Notes
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	30.00%	37.00%
Common and Preferred Stocks
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	0.00%	24.00%
Bond Exchange Traded Funds
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	32.00%	27.00%
Cash and Short-term Investments
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	36.00%	2.00%
Other Assets
Defined Benefit Plan Disclosure [Line Items]
Weighted-average asset allocations	2.00%	10.00%

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- 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

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- Definition

Percentage of actual 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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