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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Recently Issued Accounting Pronouncements (Details) ¥ in Millions, $ in Millions | Dec. 31, 2020 CNY (¥) ¥ / $ | Dec. 31, 2020 USD ($) ¥ / $ | Jan. 01, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
--- | --- | --- | --- | ---
Recently issued accounting pronouncements |  |  |  |
Adjustment to retained earnings | ¥ 1,502 | $ 230 |  | ¥ 3,701
Right-to-use assets | 28,980 | $ 4,441 |  | 20,875
Lease liabilities | ¥ 30,454 |  |  | ¥ 22,055
Translation into United States Dollars |  |  |  |
Foreign exchange rate used to translate amounts denominated in RMB to US dollar | ¥ / $ | 6.5250 | 6.5250 |  |
ASU 2016-13 | Restatement |  |  |  |
Recently issued accounting pronouncements |  |  |  |
Adjustment to retained earnings |  |  | ¥ 7 |

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