Pension and Postretirement Plans (Narrative) (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
United States
Defined Benefit Plan Disclosure [Line Items]
Company contributions to plans	$ 4
Additional contributions expected to be made during remainder of fiscal year	42
Pension Benefits \| Int’l.
Defined Benefit Plan Disclosure [Line Items]
Company contributions to plans	7
Additional contributions expected to be made during remainder of fiscal year	$ 20

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration