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PRINCIPAL ACCOUNTING POLICIES - RSUs activities (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted average grant date fair value
Unrecognized compensation cost	$ 350
Weighted average vesting period	2 years 4 months 24 days
Restricted stock units (RSUs)
Number of Shares
Unvested at beginning year (in shares)	869,620	934,512	4,008,768
Granted (in shares)	255,000	255,004	550,888
Vested (in shares)	(243,625)	(215,484)	(3,439,944)
Forfeited (in shares)	(129,489)	(104,412)	(185,200)
Unvested at end of year (in shares)	751,506	869,620	934,512
Weighted average grant date fair value
Unvested at beginning of year (in dollars per share)	$ 32.65	$ 33.79	$ 37.94
Granted (in dollars per share)	24.67	31.35	28.49
Vested (in dollars per share)	36.15	37.26	37.53
Forfeited (in dollars per share)	33.92	30.12	38.42
Unvested at end of year (in dollars per share)	$ 28.59	$ 32.65	$ 33.79
Unrecognized compensation cost	$ 14
Weighted average vesting period	1 year 10 months 24 days

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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-Publisher FASB
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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