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Goodwill and Specifically Identifiable Intangible Assets (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Goodwill and Specifically Identifiable Intangible Assets [Abstract]
Impairment of intangibles	$ 905

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- References

No definition available.

+ Details

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- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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