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Estimates (Components Of Intangibles And Other Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Gross Carrying Amount	$ 7,560	$ 7,458
Accumulated Amortization	(1,560)	(1,342)
Customer relationships, contracts and agreements (3 to 46 years)
Gross Carrying Amount	7,106	6,979
Accumulated Amortization	(1,493)	(1,277)
Patents (10 years)
Gross Carrying Amount	48	48
Accumulated Amortization	(30)	(26)
Trade names (20 years)
Gross Carrying Amount	66	66
Accumulated Amortization	(28)	(25)
Total Amortizable Intangible Assets [Member]
Gross Carrying Amount	7,253	7,121
Accumulated Amortization	(1,560)	(1,342)
Trademarks [Member]
Gross Carrying Amount	295	295
Accumulated Amortization	0	0
Other non-amortizable intangible assets [Member]
Gross Carrying Amount	12	42
Accumulated Amortization	0	0
Other Amortizable Intangible Assets [Member]
Gross Carrying Amount	33	28
Accumulated Amortization	(9)	(14)
Non-amortizable intangible assets [Member]
Gross Carrying Amount	307	337
Accumulated Amortization	$ 0	$ 0

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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