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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - NARRATIVE (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Aug. 08, 2019 USD ($) | Dec. 31, 2020 USD ($) employee | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure |  |  |  |  |
Accrued liabilities for the supplemental retirement plan |  |  | $ 239 | $ 261 |
Expenses under provisions of defined contribution and supplemental retirement plans |  |  | 192 | 192 | $ 152
Total benefit costs, including postretirement costs |  |  | $ 235 | 220 | $ 182
United States |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Number of employees accruing benefits under defined benefit plans | employee |  |  | 400 |  |
Foreign |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Number of employees accruing benefits under defined benefit plans | employee |  |  | 300 |  |
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |  |
Additions due to the Acquisition |  | $ 193 | $ 0 | 2,136 |
Curtailment gain | $ 124 |  | 278 | 136 |
Offset to accumulated other comprehensive income | 154 |  |  |  |
Decrease to benefit obligation | $ 278 |  | $ 8 | $ (13) |

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- Definition This element represents the number of employees currently accruing benefits under defined benefit plans. + References No definition available. + Details
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- Definition Defined Benefit Plan Obligation, Offset To Accumulated Other Comprehensive Income + References No definition available. + Details
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- Definition This element represents the accrued liabilities for supplemental retirement benefit plan which provides restoration of benefit lost due to government limitations on qualified retirement benefits. + References No definition available. + Details
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- Definition Amount of increase in benefit obligation of defined benefit plan from business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(8) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of (increase) decrease in benefit obligation of defined benefit plan from event reducing expected years of future service of present employees or eliminating accrual of benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change, classified as other. + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits. + References No definition available. + Details
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- Details
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- Details
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- Details
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