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Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Pension And Other Benefit Programs (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Cumulative effect, adjustment unrealized losses, unrecognized			$ 0
U.S. Defined-Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) amortization period	20 years	8 years