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Significant mergers and acquisitions and investments - Equity investments and others (Details) ¥ / shares in Units, ¥ in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 27, 2022 CNY (¥) | Oct. 31, 2021 CNY (¥) | Aug. 31, 2021 CNY (¥) | Aug. 31, 2021 USD ($) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2021 HKD ($) | Feb. 28, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 CNY (¥) | Oct. 31, 2019 USD ($) | Sep. 30, 2019 CNY (¥) employee | Jul. 31, 2019 CNY (¥) | May 31, 2019 CNY (¥) ¥ / shares | May 31, 2019 HKD ($) | Aug. 31, 2014 | Dec. 31, 2019 CNY (¥) | Dec. 31, 2020 CNY (¥) | Mar. 31, 2022 CNY (¥) | Mar. 31, 2021 CNY (¥) | Mar. 31, 2020 CNY (¥) | Mar. 31, 2014 | Nov. 30, 2020 | Aug. 31, 2020 | Oct. 31, 2019 CNY (¥) | Sep. 30, 2019 USD ($) employee
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain in interest and investment income, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 71,561 |  |  |  |  |
Profit Share Payments | Ant Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional fee, as a percentage of pre-tax income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37.50% |  |  |  |
Amounts earned by the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,835 |  |  |  |  |
SAPA | Pre-emptive rights | Ant Group | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration to be received from related party | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
SAPA | Corporate governance provisions | Ant Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of officers or employees | employee |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Number of officers nominated | employee |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 IPLA | Profit Share Payments | Ant Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional fee, as a percentage of pre-tax income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37.50% |  |  |  |  |  |  |  |  |  |
Amounts earned by the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,835 |  |  |  |  |
Bilibili, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  | ¥ 4,885 | $ 5,818 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  | 8.00% | 8.00% | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |
STO Express |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 4,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired |  |  |  |  |  |  |  |  |  |  |  |  | 14.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest the Company may elect to acquire |  |  |  |  |  |  |  |  |  |  |  |  | 31.30% |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Losses relating to options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 36 | ¥ 1,413 | 1,766 |  |  |  |  |
Purchase consideration |  |  |  |  |  |  | ¥ 3,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated to net assets acquired |  |  |  |  |  |  | ¥ 2,002 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
STO Express | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest the Company may elect to acquire | 21.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | ¥ 6,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
STO Express | Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  | 1,731 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
STO Express | Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  | 2,433 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
STO Express | Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  | ¥ 477 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mango Excellent Media Co |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  | ¥ 6,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
China Broadcasting Network Joint Stock Corporation Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 10,000 |  |  |  |  |  |  |  |
Percentage of equity interest acquired |  |  |  |  |  |  |  | 7.00% | 7.00% |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |
YTO Express Group Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.00% |  |
Purchase consideration |  |  |  |  |  |  |  |  |  | ¥ 6,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  | 23.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated to net assets acquired |  |  |  |  |  |  |  |  |  | ¥ 3,891 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
YTO Express Group Co., Ltd | Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  | 4,442 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
YTO Express Group Co., Ltd | Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  | 4,270 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
YTO Express Group Co., Ltd | Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  | ¥ 1,171 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Meinian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 6,700 |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.00% |  |  |  |  |  | 13.00% |  |  |
Allocated to net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 191 |  |  |  |  |  |  |  |  |
Meinian | Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,573 |  |  |  |  |  |  |  |  |
Meinian | Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,579 |  |  |  |  |  |  |  |  |
Meinian | Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 643 |  |  |  |  |  |  |  |  |
AliExpress Russia Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase consideration |  |  | ¥ 1,244 | $ 192 |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  | 48.00% | 48.00% |  |  |  | 48.00% | 48.00% |  |  |  |  |  |  |  |  | 48.00% |  |  |  |  |  |  | 56.00% |
Allocated to net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,630 |
Cash consideration |  |  |  |  |  |  |  | ¥ 1,269 | $ 194 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AliExpress Russia Joint Venture | Amortizable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,325 |
AliExpress Russia Joint Venture | Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,290 |
AliExpress Russia Joint Venture | Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 116 |
AliExpress Russia businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deconsolidation gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 10,300 |  |  |  |  |
Ant Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  | 33.00%
Deferred tax effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 19,700 |  |  |  |  |
Ant Group | SAPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00%
Cost of equity interest |  |  |  |  |  |  |  |  |  |  |  | ¥ 90,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other cost reimbursement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600 |  |  |  |  |
Deferred tax effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,700 |  |  |  |  |
Gain in interest and investment income, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 71,600 |  |  |  |  |
Weighted average amortization period |  |  |  |  |  |  |  |  |  |  |  | 9 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ant Group | Amortizable intangible assets | SAPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  | ¥ 24,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ant Group | Equity investments | SAPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Difference between equity method carrying amount and underlying equity in net assets |  |  |  |  |  |  |  |  |  |  |  | ¥ 5,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Red Star |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration |  | ¥ 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest acquired |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |
Cash consideration for subscription of exchangeable bonds |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 4,359 |  |  |  |  |  |  |  |  |  |  |  |
Exchangeable bonds term (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |  |  |  |  |  |  |
Initial price of bonds exchangeable into ordinary shares | ¥ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 12.28 |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 390 | $ 447 |  |  |  |  |  |  |  |  |  |  |
Sun Art Retail Group Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (as a percent) |  |  |  |  |  |  |  |  |  | 31.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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