Goodwill - Schedule of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	$ 641	$ 2,017
Acquisition related adjustments		15
Divestitures	(2)	(1,355)
Assets held for sale	(6)	(90)
Foreign currency translation	(16)	54
Goodwill, gross	10,173	10,197
Accumulated impairment losses	(9,556)	(9,556)
Goodwill, ending balance	617	641
GBS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	641	2,017
Acquisition related adjustments		15
Divestitures	(2)	(1,355)
Assets held for sale	(6)	(90)
Foreign currency translation	(16)	54
Goodwill, gross	5,107	5,131
Accumulated impairment losses	(4,490)	(4,490)
Goodwill, ending balance	617	641
GIS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	0	0
Acquisition related adjustments		0
Divestitures	0	0
Assets held for sale	0	0
Foreign currency translation	0	0
Goodwill, gross	5,066	5,066
Accumulated impairment losses	(5,066)	(5,066)
Goodwill, ending balance	$ 0	$ 0

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.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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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.

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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.

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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.

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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

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