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Employee Benefit Plans 6 (Details)	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Employee benefit plans
Actual Asset Allocations:	100.00%	100.00%
Target Asset Allocations:	100.00%	100.00%
Pension Benefits | Equity securities
Employee benefit plans
Actual Asset Allocations:	56.00%	59.00%
Target Asset Allocations:	60.00%	60.00%
Pension Benefits | Debt securities
Employee benefit plans
Actual Asset Allocations:	38.00%	36.00%
Target Asset Allocations:	40.00%	40.00%
Pension Benefits | Real Estate Funds
Employee benefit plans
Actual Asset Allocations:	6.00%	5.00%
Pension Benefits | Cash equivalents
Employee benefit plans
Actual Asset Allocations:	0.00%	0.00%
Post-Retirement Medical Benefits
Employee benefit plans
Actual Asset Allocations:	100.00%	100.00%
Target Asset Allocations:	100.00%	100.00%
Post-Retirement Medical Benefits | Equity securities
Employee benefit plans
Actual Asset Allocations:	60.00%	63.00%
Target Asset Allocations:	60.00%	60.00%
Post-Retirement Medical Benefits | Debt securities
Employee benefit plans
Actual Asset Allocations:	39.00%	36.00%
Target Asset Allocations:	40.00%	40.00%
Post-Retirement Medical Benefits | Real Estate Funds
Employee benefit plans
Actual Asset Allocations:	0.00%	0.00%
Post-Retirement Medical Benefits | Cash equivalents
Employee benefit plans
Actual Asset Allocations:	1.00%	1.00%

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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=123450688&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=123447040&loc=d3e1928-114920

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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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