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Income Taxes - Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of period	$ 1,754	$ 958	$ 1,052
Additions based on tax positions related to prior years	14	53	20
Reductions based on tax positions related to prior years	(131)	(5)	(168)
Additions based on tax positions related to current year	14	755	82
Reductions based on settlements	(20)	(8)	(8)
Reductions based on the lapse of the applicable statutes of limitations	(102)	(12)	(13)
Exchange rate fluctuations	(6)	13	(7)
Unrecognized tax benefits at end of period	$ 1,523	$ 1,754	$ 958

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Unrecognized Tax Benefits, Increase (Decrease) Resulting from Foreign Currency Translation

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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 unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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