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Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2021	Mar. 31, 2021
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	$ 641
Foreign currency translation	(10)
Goodwill, gross	10,187	$ 10,197
Accumulated impairment losses	(9,556)	(9,556)
Goodwill, ending balance	631
GBS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	641
Foreign currency translation	(10)
Goodwill, gross	5,121	5,131
Accumulated impairment losses	(4,490)	(4,490)
Goodwill, ending balance	631
GIS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	0
Foreign currency translation	0
Goodwill, gross	5,066	5,066
Accumulated impairment losses	(5,066)	$ (5,066)
Goodwill, ending balance	$ 0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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-SubTopic 210
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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