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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |
Net periodic benefit costs: |  |  |
Service cost — benefits earned during the period | $ 45 | $ 5 | $ 6
Interest cost on projected benefit obligation | 39 | 15 | 17
Expected return on plan assets | (50) | (25) | (24)
Recognized actuarial loss | 9 | 7 | 10
Recognized prior service credit | 0 | 0 | 0
Liability (gain) loss due to curtailment | (91) | 0 | 0
Special termination benefits | 49 | 0 | 0
Other costs and adjustments | (2) | 1 | 3
Net periodic benefit cost | (1) | 3 | 12
Amounts that will be amortized from AOCI into net periodic benefit cost over the next fiscal year |  |  |
Estimated net loss that will be amortized from AOCI into net periodic benefit cost over the next fiscal year | 3 |  |
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost over the next fiscal year | 0 |  |
Postretirement Benefits |  |  |
Net periodic benefit costs: |  |  |
Service cost — benefits earned during the period | 24 | 23 | 21
Interest cost on projected benefit obligation | 36 | 34 | 38
Expected return on plan assets | 0 | 0 | 0
Recognized actuarial loss | 8 | 14 | 14
Recognized prior service credit | (8) | 0 | 0
Liability (gain) loss due to curtailment | 6 | 0 | 0
Special termination benefits | 0 | 0 | 0
Other costs and adjustments | 0 | (2) | 1
Net periodic benefit cost | 66 | $ 69 | $ 74
Amounts that will be amortized from AOCI into net periodic benefit cost over the next fiscal year |  |  |
Estimated net loss that will be amortized from AOCI into net periodic benefit cost over the next fiscal year | 12 |  |
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost over the next fiscal year | $ (8) |  |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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