Goodwill And Other Intangibles (Goodwill Rollforward) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019
Goodwill And Other Intangibles [Abstract]
Goodwill, Beginning Balance		$ 6,383
Reclassification as held for sale		(658)
Goodwill Impairment	$ (5,449)	(5,449)
Goodwill, Ending Balance	$ 276	$ 276

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration