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Unsecured senior notes (Tables) - Unsecured senior notes | 6 Months Ended
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Sep. 30, 2020
Unsecured senior notes |
Summary of the unsecured senior notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of | ​ | Effective
​ |  | March 31, 2020 | ​ | September 30, 2020 |  | interest rate
​ |  | (in millions of RMB) | ​ | ​
US$1,500 million 3.125% notes due 2021 |  | 10,604 |  | 10,196 |  | 3.26%
US$700 million 2.800% notes due 2023 | ​ | 4,946 | ​ | 4,755 | ​ | 2.90%
US$2,250 million 3.600% notes due 2024 |  | 15,891 |  | 15,274 |  | 3.68%
US$2,550 million 3.400% notes due 2027 | ​ | 17,929 | ​ | 17,235 | ​ | 3.52%
US$700 million 4.500% notes due 2034 |  | 4,906 |  | 4,715 |  | 4.60%
US$1,000 million 4.000% notes due 2037 | ​ | 7,028 | ​ | 6,754 | ​ | 4.06%
US$1,750 million 4.200% notes due 2047 | ​ | 12,291 | ​ | 11,811 | ​ | 4.25%
US$1,000 million 4.400% notes due 2057 | ​ | 7,021 | ​ | 6,746 | ​ | 4.44%
Carrying value | ​ | 80,616 | ​ | 77,486 | ​ | ​
Unamortized discount and debt issuance costs |  | 550 |  | 501 |  | ​
Total principal amounts of unsecured senior notes |  | 81,166 |  | 77,987 |  | ​
Less: current portion of principal amounts of unsecured senior notes | ​ | — | ​ | — | ​ | ​
Non-current portion of principal amounts of unsecured senior notes |  | 81,166 |  | 77,987 |  | ​
Schedule of future principal payments due | ​
​ | ​ | ​
​ |  | Principal amounts
​ |  | (in millions of RMB)
Within 1 year |  | —
Between 1 to 2 years |  | 10,217
Between 2 to 3 years |  | 4,768
Between 3 to 4 years |  | —
Between 4 to 5 years |  | 15,325
Thereafter | ​ | 47,677
​ |  | 77,987

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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