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Financial and other non-current assets - Minimum finance lease payments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of maturity analysis of finance lease payments receivable [line items] |  |
Total future payments | $ 120 | $ 191
Unearned interest income | (6) | (10)
Present value | 114 | 181
Provision | (46) | (57)
Net book value | 68 | 124
Not later than one year [member] |  |
Disclosure of maturity analysis of finance lease payments receivable [line items] |  |
Total future payments | 33 | 51
Unearned interest income | (3) | (4)
Present value | 30 | 47
Provision | (1) | (1)
Net book value | 29 | 46
Between one and five years [member] |  |
Disclosure of maturity analysis of finance lease payments receivable [line items] |  |
Total future payments | 55 | 94
Unearned interest income | (3) | (5)
Present value | 52 | 89
Provision | (18) | (23)
Net book value | 34 | 66
Later than five years [member] |  |
Disclosure of maturity analysis of finance lease payments receivable [line items] |  |
Total future payments | 32 | 46
Unearned interest income | 0 | (1)
Present value | 32 | 45
Provision | (27) | (33)
Net book value | $ 5 | $ 12

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- Definition Finance Lease Receivable, Net Book Value + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Present Value Of Finance Leases + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Provision In Finance Leases + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- 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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- Definition The amount of undiscounted finance lease payments to be received. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_94&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The amount of unearned finance income relating to the finance lease payments receivable. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. [Refer: Finance income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 94 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_94&doctype=Standard -URIDate 2020-01-01 + Details
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- Details
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- Details
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- Details
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