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Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	$ 532	$ 539
Divestitures	(3)	(3)
Foreign currency translation	(3)	(4)
Goodwill, gross	10,082	10,088
Accumulated impairment losses	(9,556)	(9,556)
Goodwill, ending balance	526	532
GBS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	532	539
Divestitures	(3)	(3)
Foreign currency translation	(3)	(4)
Goodwill, gross	5,016	5,022
Accumulated impairment losses	(4,490)	(4,490)
Goodwill, ending balance	526	532
GIS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, beginning balance	0	0
Divestitures	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

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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