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Estimates (Components Of Intangibles And Other Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Gross Carrying Amount	$ 7,953	$ 7,975
Accumulated Amortization	(2,207)	(1,821)
Customer relationships, contracts and agreements (3 to 46 years)
Gross Carrying Amount	7,513	7,535
Accumulated Amortization	(2,117)	(1,743)
Patents (10 years)
Gross Carrying Amount	48	48
Accumulated Amortization	(40)	(35)
Trade names (20 years)
Gross Carrying Amount	66	66
Accumulated Amortization	(35)	(31)
Total Amortizable Intangible Assets [Member]
Gross Carrying Amount	7,646	7,668
Accumulated Amortization	(2,207)	(1,821)
Trademarks [Member]
Gross Carrying Amount	295	295
Accumulated Amortization	0	0
Other non-amortizable intangible assets [Member]
Gross Carrying Amount	12	12
Accumulated Amortization	0	0
Other Amortizable Intangible Assets [Member]
Gross Carrying Amount	19	19
Accumulated Amortization	(15)	(12)
Non-amortizable intangible assets [Member]
Gross Carrying Amount	307	307
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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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