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Pension and Postretirement Benefits (Plan Assets by Percentage Allocation) (Details)	Dec. 31, 2020	Dec. 31, 2019
United States | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	57.00%
Pension Plan | United States | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	0.00%	0.00%
Plan assets, actual allocation (as a percent)	1.00%	1.00%
Pension Plan | United States | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	43.00%	43.00%
Plan assets, actual allocation (as a percent)	43.00%	40.00%
Pension Plan | United States | Global Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	31.00%	31.00%
Plan assets, actual allocation (as a percent)	30.00%	28.00%
Pension Plan | United States | Global Real Assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	12.00%	12.00%
Plan assets, actual allocation (as a percent)	13.00%	12.00%
Pension Plan | United States | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	57.00%	57.00%
Plan assets, actual allocation (as a percent)	56.00%	59.00%
Pension Plan | United States | Diversified Credit
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	12.00%	12.00%
Plan assets, actual allocation (as a percent)	14.00%	12.00%
Pension Plan | United States | Liability Driven Investment
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	45.00%	45.00%
Plan assets, actual allocation (as a percent)	42.00%	47.00%
Pension Plan | Foreign Plan | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	1.00%	2.00%
Plan assets, actual allocation (as a percent)	1.00%	2.00%
Pension Plan | Foreign Plan | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	2.00%	2.00%
Plan assets, actual allocation (as a percent)	2.00%	2.00%
Pension Plan | Foreign Plan | Global Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	1.00%	1.00%
Plan assets, actual allocation (as a percent)	1.00%	1.00%
Pension Plan | Foreign Plan | North American Companies
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	1.00%	1.00%
Plan assets, actual allocation (as a percent)	1.00%	1.00%
Pension Plan | Foreign Plan | Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	51.00%	50.00%
Plan assets, actual allocation (as a percent)	51.00%	50.00%
Pension Plan | Foreign Plan | Liability Driven Investment
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	12.00%	7.00%
Plan assets, actual allocation (as a percent)	12.00%	7.00%
Pension Plan | Foreign Plan | U.K. Government Gilt Index
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	39.00%	43.00%
Plan assets, actual allocation (as a percent)	39.00%	43.00%
Pension Plan | Foreign Plan | Other types
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	46.00%	46.00%
Plan assets, actual allocation (as a percent)	46.00%	46.00%
Pension Plan | Foreign Plan | Multi-Asset Category
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	20.00%	19.00%
Plan assets, actual allocation (as a percent)	20.00%	19.00%
Pension Plan | Foreign Plan | Buy-in Contracts
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	20.00%	21.00%
Plan assets, actual allocation (as a percent)	20.00%	21.00%
Pension Plan | Foreign Plan | Other
Defined Benefit Plan Disclosure [Line Items]
Plan assets, target allocation (as a percent)	6.00%	6.00%
Plan assets, actual allocation (as a percent)	6.00%	6.00%

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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=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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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
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
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