Pension and Postretirement Plans (Narrative) (Details) - U.S. Qualified Pension Plan [Member] - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Mar. 31, 2019	Nov. 02, 2019
Defined Benefit Plan Disclosure [Line Items]
Employer's contribution	$ 55
Number of years of service as threshold for frozen pension benefit accruals		11 years

Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585

Name:	us-gaap_PensionAndOtherPostretirementBenefitContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration