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Estimates (Components Of Intangibles And Other Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Gross Carrying Amount	$ 7,458	$ 6,536
Accumulated Amortization	(1,342)	(1,024)
Customer relationships, contracts and agreements (3 to 46 years)
Gross Carrying Amount	6,979	6,050
Accumulated Amortization	(1,277)	(971)
Trade names (20 years)
Gross Carrying Amount	48	48
Accumulated Amortization	(26)	(21)
Patents (10 years)
Gross Carrying Amount	66	66
Accumulated Amortization	(25)	(22)
Total Amortizable Intangible Assets [Member]
Gross Carrying Amount	7,121	6,189
Accumulated Amortization	(1,342)	(1,024)
Trademarks [Member]
Gross Carrying Amount	295	288
Accumulated Amortization	0	0
Other Amortizable Intangible Assets [Member]
Gross Carrying Amount	28	25
Accumulated Amortization	(14)	(10)
Contractual Rights [Member]
Gross Carrying Amount	42	59
Accumulated Amortization	$ 0	$ 0

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 2
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