The amount of cash and cash equivalents received on acquisition of subsidiary classified as investing activities.

No definition available.

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

This element represents the initial cost of investments accounted for under the equity method of accounting.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised net of non controlling interest as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for land use rights acquired in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of net cashflow of the acquiree since the acquisition date included in the consolidated statement of cash flows.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The amount recognised as of the acquisition date for other current assets acquired in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for non-current assets that the entity does not separately disclose in the same statement or note acquired in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for non-current liabilities that the entity does not separately disclose in the same statement or note acquired in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for other payables and accrued expenses assumed in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The entity's share of the change in reserves of associates and joint ventures accounted for using the equity method.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The amount recognised as of the acquisition date for trade and note payables assumed in a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	ach_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The acquisition-date fair value of equity interest in the acquiree held by the acquirer immediately before the acquisition date in a business combination achieved in stages. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

- References

No definition available.

+ Details

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Balance Type:	na
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- Definition

The amount recognised as of the acquisition date for borrowings assumed in a business combination. [Refer: Borrowings; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Balance Type:	credit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for cash and cash equivalents acquired in a business combination. [Refer: Cash and cash equivalents; Business combinations [member]]

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
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-Paragraph B64
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Balance Type:	credit
Period Type:	instant

- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard
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-Subparagraph a
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The amount recognised as of the acquisition date for deferred tax assets acquired in a business combination. [Refer: Deferred tax assets; Business combinations [member]]

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for deferred tax liabilities assumed in a business combination. [Refer: Deferred tax liabilities; Business combinations [member]]

+ References

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of residual interest in the assets of the entity after deducting all its liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 1
-IssueDate 2020-01-01
-Paragraph 24
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard
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-Paragraph 78
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_e&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value, at the acquisition date, of equity interests of the acquirer transferred as consideration in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
-Paragraph B64
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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value of receivables acquired in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
-Subparagraph h
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-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The gain (loss) recognised as result of remeasuring to fair value the equity interest in the acquiree held by the acquirer before the business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
-Paragraph B64
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph B67
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-Number 36
-IssueDate 2020-01-01
-Paragraph 134
-Subparagraph a
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-Paragraph 54
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
-Subparagraph i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B
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-URIDate 2020-01-01

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount recognised as of the acquisition date for identifiable intangible assets acquired in a business combination. [Refer: Intangible assets other than goodwill; Business combinations [member]]

+ References

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The amount recognised as of the acquisition date for inventory acquired in a business combination. [Refer: Inventories; Business combinations [member]]

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 8
-IssueDate 2020-01-01
-Paragraph 24
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-IssueDate 2020-01-01
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-Paragraph 54
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
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- Definition

The profit (loss) of the acquiree, since the acquisition date, included in the consolidated statement of comprehensive income. [Refer: Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 3
-IssueDate 2020-01-01
-Paragraph B64
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- Definition

The amount recognised as of the acquisition date for plant, property and equipment acquired in a business combination. [Refer: Property, plant and equipment; Business combinations [member]]

+ References

+ Details

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- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

+ References

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-Number 27
-IssueDate 2020-01-01
-Paragraph 17
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The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]

+ References

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-Paragraph 55
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The amount of revenue of the acquiree since the acquisition date included in the consolidated statement of comprehensive income. [Refer: Revenue]

+ References

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- Definition

The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)]

+ References

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective on first application of IFRS 9
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-IssueDate 2020-01-01
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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BUSINESS COMBINATION - Shanxi Huaxing (Details) ¥ in Thousands, $ in Thousands		1 Months Ended	12 Months Ended
	Dec. 06, 2018 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017	Dec. 31, 2020 CNY (¥)	Jan. 01, 2020 CNY (¥)	Jan. 01, 2019 CNY (¥)	Jan. 01, 2018 CNY (¥)
Assets
Intangible assets								¥ 0
Restricted cash					¥ 1,305,781			1,056,037
Liabilities
Contract liabilities					(1,579,322)			(1,638,826)
Goodwill								3,510,000
Equity		¥ 67,699,521	$ 10,907,543		70,757,466	¥ 67,699,521		¥ 71,171,716	¥ 70,757,466	¥ 67,699,521	¥ 65,668,302
Investment income recognized under the equity method			$ 49,998	¥ 326,239	¥ 318,882	(160,117)
Gain on previously held equity interest remeasured at acquisition-date fair value						¥ 748,086
Shanxi Huaxing
BUSINESS COMBINATION
Equity interest acquired (as a percent)	50.00%	50.00%				50.00%
Assets
Property, plant and equipment	¥ 7,327,807
Intangible assets	728,067
Land use rights	348,901
Deferred tax assets	8,094
Other non-current assets	60,336
Other current assets	102,396
Inventories	865,418
Trade and notes receivables	44,706
Restricted cash	203,350
Cash and cash equivalents	81,344
Liabilities
Deferred tax liabilities	(722,349)
Interest bearing loans and borrowings	(1,743,036)
Other non-current liabilities	(239,998)
Contract liabilities	(617,827)
Other payables and accrued expenses	(686,024)
Trade and notes payables	(1,594,724)
Net assets	4,166,461
Share of net assets acquired	4,166,461
Goodwill	1,163,949
Cash consideration	2,665,205	¥ 2,655,205				¥ 2,655,205
Fair value of previously held equity interest	2,665,205
Equity	5,330,410
Initial investment cost	2,351,479
Investment income recognized under the equity method	(77,309)
Share of changes in reserves under the equity method	11,166
Cash dividends declared	(236,556)
Book value of the investment	2,048,780
Fair value of the investment	2,665,205
Gain on previously held equity interest remeasured at acquisition-date fair value	616,425
Cash and bank balances acquired	81,344
Net inflow of cash and cash equivalents included in cash flows from investing activities	¥ (2,583,861)
Revenue		415,509
Profit for the year		110,917
Net cash flows		¥ (434)
Shanxi Huaxing \| The Group
BUSINESS COMBINATION
Proportion of ownership interest in associate		100.00%
Shanxi Huaxing \| Shanxi Huaxing
BUSINESS COMBINATION
Proportion of ownership interest in associate							50.00%
Chalco Hong Kong \| Shanxi Huaxing
BUSINESS COMBINATION
Proportion of ownership interest in associate							10.00%
Baotou Communication Investment Group Limited [Member] \| Shanxi Huaxing
BUSINESS COMBINATION
Proportion of ownership interest in associate							40.00%