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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits |  |  |
Net periodic benefit costs: |  |  |
Service cost - benefits earned during the period | $ 6 | $ 7 | $ 7
Interest cost on projected benefit obligation | 17 | 18 | 18
Expected return on plan assets | (24) | (24) | (27)
Recognized actuarial loss | 10 | 12 | 10
Other costs and adjustments | 3 | 4 | (4)
Net periodic benefit cost | 12 | 17 | 4
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 | 5 |  |
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 | 21 | 20 | 26
Interest cost on projected benefit obligation | 38 | 39 | 40
Recognized actuarial loss | 14 | 15 | 27
Other costs and adjustments | 1 |  | 1
Net periodic benefit cost | 74 | $ 74 | $ 94
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 | 17 |  |
Estimated prior service cost that will be amortized from AOCI into net periodic benefit cost over the next fiscal year | $ 1 |  |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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