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Equity securities and other investments - Equity securities summary (Details) - CNY (¥) ¥ in Millions	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Net unrealized gains (losses) recognized during the period for equity securities still held as of the end of the period	¥ 25,940	¥ (9,624)
Net gains recognized during the period from disposals of equity securities during the period	3	496
Net gains (losses) recognized during the period on equity securities	25,943	(9,128)
Upward adjustments	3,776	1,742
Impairments and downward adjustments	5,667	5,854
Investments in privately held companies recorded using measurement alternative	77,082		¥ 80,939
Realized gains or losses on disposal of debt investments	0	0
Impairment losses on debt investments	¥ 97	¥ 841

X

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Excludes other-than-temporary impairment (OTTI).

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
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- Definition

Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

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- Definition

Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
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Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Amount of unrealized gain (loss) on investment in marketable security.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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Amount of other-than-temporary impairment (OTTI) on investment in debt security, recognized in earnings.

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-Publisher FASB
-Name Accounting Standards Codification
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