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Share-based awards - Share-based awards relating to Ant Financial (Details) - CNY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Share-based awards
Share-based compensation expense	¥ 32,409	¥ 15,260
Share-based awards relating to Ant Group
Share-based awards
Share-based compensation expense	¥ 16,329	¥ 655
Share-based awards relating to Ant Group | Share-based awards with four-year vesting schedule
Share-based awards
Vesting period	4 years
Vesting percentage	25.00%
Share-based awards relating to Ant Group | Share-based awards with four-year vesting schedule and initial vesting at first anniversary
Share-based awards
Vesting percentage	25.00%
Share-based awards relating to Ant Group | Share-based awards with four-year vesting schedule and initial vesting at second anniversary
Share-based awards
Vesting percentage	50.00%
Share-based awards relating to Ant Group | Share-based awards with six-year vesting schedule
Share-based awards
Vesting period	6 years

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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