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Related party transactions- Transactions with related parties (Details) ¥ in Millions, $ in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 CNY (¥) | Sep. 30, 2019 CNY (¥) | Mar. 31, 2014 | Sep. 30, 2020 USD ($) | Sep. 30, 2020 HKD ($) | Mar. 31, 2020 CNY (¥) | Mar. 31, 2019 CNY (¥)
Related party transactions |  |  |  |  |  |  |
Amount of cash and cash equivalents | ¥ 301,509 |  |  | $ 44,407 |  | ¥ 330,503 |
Cash held in accounts managed by Alipay |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amount of cash and cash equivalents | 7,293 |  |  |  |  |  | ¥ 7,293
Ant Group and its affiliates |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company | 4,861 | ¥ 6,789 |  |  |  |  |
Expenses incurred | 6,906 | 6,006 |  |  |  |  |
Ant Group and its affiliates | Annual fee for SME loan business |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company | 478 | 478 |  |  |  |  |
Ant Group and its affiliates | Cloud computing revenue |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company | 2,377 | 614 |  |  |  |  |
Ant Group and its affiliates | Marketplace software technology services fee and other amounts earned |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company | 1,441 | 1,251 |  |  |  |  |
Ant Group and its affiliates | Other services |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Expenses incurred | 2,102 | 1,445 |  |  |  |  |
Alipay | Payment processing and escrow services fee |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Expenses incurred | 4,804 | ¥ 4,561 |  |  |  |  |
Ant Group |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Equity interest (as a percent) |  | 33.00% |  |  |  |  |
Ant Group | Profit Share Payments |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company |  | ¥ 3,835 |  |  |  |  |
Additional fee, as a percentage of pre-tax income |  |  | 37.50% |  |  |  |
Ant Group | Administrative and support services |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company | ¥ 565 | ¥ 611 |  |  |  |  |
Hong Kong Cingleot Investment Management Limited |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Loan facility guaranteed | $ |  |  |  |  | $ 7,700 |  |
Amount drawn down | $ |  |  |  |  | $ 618 |  |
Related parties who provide and receive certain services | Other related party transactions relating to services provided and received | Maximum |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Percentage of total revenue that are from related parties | 1.00% | 1.00% |  |  |  |  |
Certain investees of the Company | Commercial arrangements related to cloud computing services |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company | ¥ 1,207 | ¥ 639 |  |  |  |  |
Certain investees of the Company | Commercial arrangements related to marketing services |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Expenses incurred | 730 | 502 |  |  |  |  |
Certain investees of the Company | Logistics services |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amounts earned by the Company | 808 | 553 |  |  |  |  |
Expenses incurred | 4,969 | ¥ 5,391 |  |  |  |  |
Certain investees of the Company | Loans |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Amount of outstanding loans | ¥ 6,079 |  |  |  |  |  |
Certain investees of the Company | Loans | Minimum |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Loans maturity period (in years) | 1 year |  |  |  |  |  |
Certain investees of the Company | Loans | Maximum |  |  |  |  |  |  |
Related party transactions |  |  |  |  |  |  |
Loans maturity period (in years) | 10 years |  |  |  |  |  |
Interest rate (as a percent) | 6.00% |  |  |  |  |  |

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