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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 8,507	$ 8,465
Accumulated Amortization	4,816	4,422
Net Carrying Value	3,691	4,043
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,096	4,014
Accumulated Amortization	2,944	2,733
Net Carrying Value	1,152	1,281
Customer related intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,176	4,212
Accumulated Amortization	1,817	1,641
Net Carrying Value	2,359	2,571
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	235	239
Accumulated Amortization	55	48
Net Carrying Value	$ 180	$ 191

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- 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
-Paragraph 2
-Subparagraph (a)(1)
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Amount before 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 928
-SubTopic 340
-Section 50
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
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