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Significant equity transactions, restructuring transactions, mergers and acquisitions and equity investments- Restructuring of Payment Services (Details) ¥ in Millions, shares in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
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Aug. 31, 2014 USD ($) item | Aug. 31, 2014 CNY (¥) item | May 31, 2014 USD ($) | Dec. 31, 2011 | Mar. 31, 2017 USD ($) | Mar. 31, 2017 CNY (¥) | Mar. 31, 2016 CNY (¥) | Mar. 31, 2015 CNY (¥) | Mar. 31, 2012 USD ($) item director shares | Mar. 31, 2017 CNY (¥) | Feb. 28, 2015 CNY (¥)
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Restricted cash and escrow receivables |  |  |  |  | $ (386) |  | ¥ (1,346) |  |  | ¥ (2,655) |
Loan receivables, net |  |  |  |  |  |  | (390) |  |  | (812) |
Escrow money payable |  |  |  |  | (337) |  |  |  |  | ¥ (2,322) |
Amount of amortization of the excess value recorded |  |  |  |  | $ 38 | ¥ 264 | 264 | ¥ 166 |  |  |
Two directors of the Company |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Number of directors of the Company (in directors) | director |  |  |  |  |  |  |  |  | 2 |  |
Ant Financial Services and Alipay | Royalty fee and software technology services fee |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Amount earned by the Company |  |  |  |  |  | 2,086 | 1,122 | 1,667 |  |  |
Alipay | Royalty fee and software technology services fee |  |  |  |  |  |  |  |  |  |  |
Intellectual Property License and Software Technology Services Agreement |  |  |  |  |  |  |  |  |  |  |
Additional fee, as a percentage of pre-tax income |  |  |  | 49.90% |  |  |  |  | 49.90% |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Amount earned by the Company |  |  |  |  |  | 2,086 | 1,122 | 1,667 |  |  |
Alipay | Royalty fee and software technology services fee | Minimum |  |  |  |  |  |  |  |  |  |  |
Intellectual Property License and Software Technology Services Agreement |  |  |  |  |  |  |  |  |  |  |
Additional fee, as a percentage of pre-tax income, after downward adjustments |  |  |  |  |  |  |  |  | 30.00% |  |
Alipay | Payment processing fee |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Initial term of agreement |  |  |  |  |  |  |  |  | 50 years |  |
Expenses incurred |  |  |  |  |  | 5,487 | 4,898 | 3,853 |  |  |
Ant Financial Services | Payment processing fee |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Number of payments that may be payable to Company to compensate for changes required regulatory authorities (in payments) | item |  |  |  |  |  |  |  |  | 1 |  |
Ant Financial Services | Sale of micro loan business and related services | Adjustment |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Restricted cash and escrow receivables |  |  |  |  |  |  |  |  |  |  | ¥ 3,495
Loan receivables, net |  |  |  |  |  |  |  |  |  |  | 23,363
Secured borrowings |  |  |  |  |  |  |  |  |  |  | 15,417
Escrow money payable |  |  |  |  |  |  |  |  |  |  | ¥ 3,495
Ant Financial Services | Amended Alipay IPLA |  |  |  |  |  |  |  |  |  |  |
Intellectual Property License and Software Technology Services Agreement |  |  |  |  |  |  |  |  |  |  |
Additional fee, as a percentage of pre-tax income | 37.50% | 37.50% |  |  |  |  |  |  |  |  |
Framework Agreement | Alipay |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Equity value or enterprise value of Alipay, limitation effecting Liquidity Event | $ |  |  |  |  |  |  |  |  | $ 1,000 |  |
Framework Agreement | Minimum | Alipay |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Percentage of securities of Alipay that may be transferred to Company, so that minimum US$2.0 billion amount applies to Liquidity Payment |  |  |  |  |  |  |  |  | 37.50% |  |
Percentage of securities of Alipay that may be transferred, occurrence of Liquidity Event |  |  |  |  |  |  |  |  | 37.50% |  |
Framework Agreement | Two directors of the Company |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Number of shares in the Company contributed by two directors that serve as security for Promissory Note | shares |  |  |  |  |  |  |  |  | 50 |  |
Framework Agreement | Ant Financial Services | Alipay |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Percentage of the equity value of Alipay |  |  |  |  |  |  |  |  | 37.50% |  |
Framework Agreement | Ant Financial Services | Minimum |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Liquidity Payment plus US$500 million | $ |  |  |  |  |  |  |  |  | $ 2,000 |  |
Framework Agreement | Ant Financial Services | Maximum |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Liquidity Payment plus US$500 million | $ |  |  |  |  |  |  |  |  | 6,000 |  |
Framework Agreement | APN |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Face value of Promissory Note deductible in calculation of Liquidity Payment | $ |  |  |  |  |  |  |  |  | $ 500 |  |
Maturity of Promissory Note |  |  |  |  |  |  |  |  | 7 years |  |
Amended Framework Agreement | Ant Financial Services |  |  |  |  |  |  |  |  |  |  |
Restructuring of Payment Services |  |  |  |  |  |  |  |  |  |  |
Increase in the Liquidity Payment due to cancellation of Promissory Note | $ |  |  | $ 500 |  |  |  |  |  |  |  |
2014 SAPA | Ant Financial Services |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Number of payments that the Company may elect to receive (in payments) | item | 1 | 1 |  |  |  |  |  |  |  |  |
Percentage of the equity value of Ant Financial Services that Company may elect to receive (as a percent) | 37.50% |  |  |  |  |  |  |  |  |  |
Percentage of the equity value of Ant Financial Services, Company purchase of newly issued equity interests (as a percent) | 33.00% | 33.00% |  |  |  |  |  |  |  |  |
Expected term of the restructured arrangement | 5 years | 5 years |  |  |  |  |  |  |  |  |
Amount of amortization of the excess value recorded |  |  |  |  |  | 264 | 264 | 166 |  |  |
2014 SAPA | Ant Financial Services | Minimum |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Implied equity value in the event of an IPO of Ant Financial Services or Alipay that must be exceeded for the Company to receive one-time payment (in dollars) | $ | $ 25,000 |  |  |  |  |  |  |  |  |  |
Gross proceeds from an IPO of Ant Financial Services or Alipay that must be exceeded for the Company to receive one-time payment (in dollars) | $ | $ 2,000 |  |  |  |  |  |  |  |  |  |
2014 SAPA | Ant Financial Services | Maximum |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Company's equity interests in Ant Financial Services that must not be exceeded for the Company to receive one-time payment (as a percent) | 33.00% |  |  |  |  |  |  |  |  |  |
2014 SAPA | Ant Financial Services | Sale of micro loan business and related services |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Cash consideration received |  | ¥ 3,219 |  |  |  |  |  |  |  |  |
Gain on disposal |  |  |  |  |  |  |  | 306 |  |  |
2014 SAPA | Ant Financial Services | SME Annual Fee |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Annual fee as a percentage of the average daily book balance (as a percent) | 2.50% | 2.50% |  |  |  |  |  |  |  |  |
Amount earned by the Company |  |  |  |  |  | ¥ 847 | ¥ 708 | ¥ 90 |  |  |
2014 SAPA | Ant Financial Services | Amended Alipay IPLA |  |  |  |  |  |  |  |  |  |  |
Intellectual Property License and Software Technology Services Agreement |  |  |  |  |  |  |  |  |  |  |
Additional fee, as a percentage of pre-tax income | 37.50% | 37.50% |  |  |  |  |  |  |  |  |
2014 SAPA | Director And Major Shareholder |  |  |  |  |  |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |  |  |  |  |
Value of restructured arrangement in excess of value of pre-existing arrangement, equity contribution by shareholder (in renminbi) |  | ¥ 1,300 |  |  |  |  |  |  |  |  |

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