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Long-Term Debt - Summary of the Company's Unsecured Senior Notes (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Carrying value | ¥ 8,340,922 | ¥ 3,414,628
Unamortized discount and debt issuance costs | 141,448 | 73,472
Total principal amounts of unsecured senior notes | 8,482,370 | 3,488,100
US$500,000 1.375% notes due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Carrying value | ¥ 3,204,309 | ¥ 3,414,628
Effective interest rate | 1.74% |
US$800,000 1.25% notes due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Carrying value | ¥ 5,136,613 |
Effective interest rate | 1.52% |

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