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DEBT - Capped Call Options (Details) - Call Option ¥ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 CNY (¥) $ / item | Dec. 31, 2019 USD ($) $ / item
Debt Instrument [Line Items] |  |
Cap price of the capped call transactions per ADS | 221.31 | 221.31
Premium paid for capped call transactions | ¥ 177 | $ 27

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- Definition The cash outflow from the repayment of premium for the capped call transactions. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant

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- Details
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Period Type: |