FINANCIAL RISK MANAGEMENT - LIQUIDITY RISK (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	[1]	Dec. 31, 2020 CNY (¥)
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Net current liabilities	¥ 1,304,655,000
Capital expenditure contracted for but not recognized as liabilities	¥ 46,553,000			¥ 444,270,000
Number of months Group maintains sufficient liquidity	12 months
Payables for fixed assets and construction-in-progress	¥ 2,776,708,000	$ 435,726		2,914,696,000
Lease liabilities	1,384,084,000			1,377,573,000
Dividends payable	13,746,000	$ 2,157		13,749,000
Total	8,657,718,000			7,723,952,000
Liquidity risk [member]
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Trade and bill payables and other payables excluding non-financial liabilities	4,483,180,000			3,417,934,000
Payables for fixed assets and construction-in-progress	2,776,708,000			2,914,696,000
Lease liabilities	5,925,660,000			5,986,680,000
Dividends payable	13,746,000			13,749,000
Total	13,199,294,000			12,333,059,000
Liquidity risk [member] | Within 1 year [member]
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Trade and bill payables and other payables excluding non-financial liabilities	4,483,180,000			3,417,934,000
Payables for fixed assets and construction-in-progress	2,776,708,000			2,914,696,000
Lease liabilities	63,249,000			61,880,000
Dividends payable	13,746,000			13,749,000
Total	7,336,883,000			6,408,259,000
Liquidity risk [member] | Between 1 and 5 years [member]
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Trade and bill payables and other payables excluding non-financial liabilities	0			0
Payables for fixed assets and construction-in-progress	0			0
Lease liabilities	263,961,000			258,820,000
Dividends payable	0			0
Total	263,961,000			258,820,000
Liquidity risk [member] | Over 5 years [member]
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]
Trade and bill payables and other payables excluding non-financial liabilities	0			0
Payables for fixed assets and construction-in-progress	0			0
Lease liabilities	5,598,450,000			5,665,980,000
Dividends payable	0			0
Total	¥ 5,598,450,000			¥ 5,665,980,000

[1] Translation of amounts from Renminbi (“RMB”) into United States dollars (“US$”) for the convenience of the reader has been made at US$1.00=RMB6.3726, the certified exchange rates for December 30, 2021 as published by the Federal Reserve Board of the United States. No representation is made that the RMB amounts could have been, or could be, converted into US$ at that rate on December 30, 2021 or on any other date.