Retirement Plans and Postretirement Medical Benefits (Target Asset Allocation) (Details)	Dec. 31, 2020	Dec. 31, 2019
United States
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Percent of Plan Assets	100.00%	100.00%
United States \| Equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	27.00%
Percent of Plan Assets	33.00%	30.00%
United States \| Multi-asset credit
Defined Benefit Plan Disclosure [Line Items]
Target allocation	4.00%
Percent of Plan Assets	0.00%	0.00%
United States \| Fixed income
Defined Benefit Plan Disclosure [Line Items]
Target allocation	60.00%
Percent of Plan Assets	62.00%	63.00%
United States \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation	8.00%
Percent of Plan Assets	4.00%	5.00%
United States \| Private equity
Defined Benefit Plan Disclosure [Line Items]
Target allocation	1.00%
Percent of Plan Assets	1.00%	2.00%
Foreign
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Percent of Plan Assets	100.00%	100.00%
Foreign \| Equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	5.00%
Percent of Plan Assets	6.00%	35.00%
Foreign \| Non-U.K. equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	15.00%
Percent of Plan Assets	16.00%	0.00%
Foreign \| Fixed income
Defined Benefit Plan Disclosure [Line Items]
Target allocation	60.00%
Percent of Plan Assets	60.00%	46.00%
Foreign \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Percent of Plan Assets	8.00%	9.00%
Foreign \| Diversified growth
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Percent of Plan Assets	9.00%	9.00%
Foreign \| Cash
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Percent of Plan Assets	1.00%	1.00%

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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

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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=118255775&loc=d3e1928-114920

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