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POST-RETIREMENT BENEFITS - Other Post-Retirement Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |
Weighted average duration of defined benefit obligation | 8 years | 9 years
Estimate of contributions, Less than a year | $ 4 | $ 27
Estimate of contributions, between 1-2 years | 4 | 7
Estimate of contributions, between 2-5 years | 12 | 21
Estimate of contributions, over 5 years | 36 | 98
Total | 56 | 153
Defined pension benefits |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Estimate of contributions, Less than a year | 4 | 27
Estimate of contributions, between 1-2 years | 4 | 7
Estimate of contributions, between 2-5 years | 12 | 20
Estimate of contributions, over 5 years | 36 | 95
Total | 56 | 149
Other post-retirement benefits |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Estimate of contributions, Less than a year | 0 | 0
Estimate of contributions, between 1-2 years | 0 | 0
Estimate of contributions, between 2-5 years | 0 | 1
Estimate of contributions, over 5 years | 0 | 3
Total | $ 0 | $ 4

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_147_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_147_c&doctype=Standard -URIDate 2019-03-27 + Details
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