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Intangible Assets - Schedule of Intangible Assets by Class (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 20,997	$ 20,696
Accumulated Amortization	6,729	5,338
Net Book Value	14,268	15,358
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,059	15,271
Accumulated Amortization	4,712	3,668
Net Book Value	10,347	11,603
Acquired software and technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,380	2,562
Accumulated Amortization	827	879
Net Book Value	1,553	1,683
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	614	618
Accumulated Amortization	213	172
Net Book Value	401	446
Purchased software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,132	913
Accumulated Amortization	443	207
Net Book Value	689	706
Capitalized software and other intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,812	1,332
Accumulated Amortization	534	412
Net Book Value	$ 1,278	$ 920

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
-SubTopic 30
-Section 50
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Amount before 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
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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