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Investment securities and fair value disclosure- Rollforward of assets (Details) - Convertible and exchangeable bonds - CNY (¥) ¥ in Millions | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Convertible and exchangeable bonds accounted for under the fair value option |  |
Balance at beginning | ¥ 4,622 | ¥ 3,719
Net increase (decrease) in fair value | (113) | 630
Conversion or exchange | (4,678) |
Foreign currency translation adjustments | ¥ 169 | 273
Balance at end |  | ¥ 4,622

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- Definition Amount of conversion or exchange adjustments for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
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- Definition Amount of foreign currency translation adjustments for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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