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DEBT - Capped Call Options (Details) - Call Option ¥ in Millions, $ in Millions	12 Months Ended
	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

X

- Definition

The cash outflow from the repayment of premium for the capped call transactions.

+ References

No definition available.

+ Details

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X

- 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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X

- 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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X

- Details

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