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POST-RETIREMENT BENEFITS - Post-employment Amounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | $ (43) | $ (43)
Income statement charge | (1) | 1
Measurements | (4) | (3)
Gains (losses) arising from settlements, net defined benefit liability (asset) | 1 |
Defined pension benefits |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | (42) | (39)
Income statement charge | 2 | 1
Measurements | $ (4) | $ (5)
Defined pension benefits | Minimum |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 1.95% | 2.50%
Defined pension benefits | Maximum |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Discount rate | 2.20% | 3.30%
Defined pension benefits | Present value of obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | $ (42) | $ (39)
Defined pension benefits | Impact of minimum funding requirement/asset ceiling |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | 0 | 0
Defined pension benefits | Funded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | 5 | 7
Defined pension benefits | Funded plans | Present value of obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | 0 | (69)
Defined pension benefits | Funded plans | Fair value of plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | 5 | 76
Defined pension benefits | Unfunded plans | Present value of obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | (47) | (46)
Other post-retirement benefits |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Liability in the balance sheet | (1) | (4)
Income statement charge | (3) | 0
Measurements | $ 0 | $ 2
Discount rate | 2.25% | 3.35%

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- Definition Post-employment Benefit Expense (income), Defined Benefit Plans + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_144&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 141 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_141_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_140_a&doctype=Standard -URIDate 2019-03-27 + Details
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