Retirement Plans and Postretirement Medical Benefits (Target Asset Allocation) (Details)	Dec. 31, 2018	Dec. 31, 2017
United States
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Percent of Plan Assets	100.00%	100.00%
United States \| U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	14.00%
Percent of Plan Assets	13.00%	15.00%
United States \| Non-U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	13.00%
Percent of Plan Assets	13.00%	15.00%
United States \| Commingled fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	63.00%
Percent of Plan Assets	64.00%	62.00%
United States \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation	5.00%
Percent of Plan Assets	7.00%	6.00%
United States \| Private equity
Defined Benefit Plan Disclosure [Line Items]
Target allocation	5.00%
Percent of Plan Assets	3.00%	2.00%
Foreign
Defined Benefit Plan Disclosure [Line Items]
Target allocation	100.00%
Percent of Plan Assets	100.00%	100.00%
Foreign \| U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Percent of Plan Assets	9.00%	10.00%
Foreign \| Non-U.S. equities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	30.00%
Percent of Plan Assets	29.00%	29.00%
Foreign \| Commingled fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation	40.00%
Percent of Plan Assets	41.00%	41.00%
Foreign \| Real estate
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Percent of Plan Assets	10.00%	9.00%
Foreign \| Diversified growth
Defined Benefit Plan Disclosure [Line Items]
Target allocation	10.00%
Percent of Plan Assets	10.00%	9.00%
Foreign \| Cash
Defined Benefit Plan Disclosure [Line Items]
Target allocation	0.00%
Percent of Plan Assets	1.00%	2.00%

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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=112275985&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=108410482&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=108410482&loc=d3e1928-114920

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