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PENSION AND POSTRETIREMENT EMPLOYEE BENEFIT PLANS - Fair value of pension and postretirement benefit plan assets assumed in connection with the Acquisition (Details) - Pension Benefit Plans - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 216 | $ 187 | $ 206
Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 216 | 187 |
Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 161 | 147 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1 | 2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1 | 0 |
Significant Other Observable Inputs (Level 2) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 215 | 185 |
Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 159 | 147 |
Significant Unobservable Inputs (Level 3) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1 | 0 |
Cash and cash equivalents | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1 | 2 |
Cash and cash equivalents | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 9 | 7 |
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1 | 2 |
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 9 | 7 |
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash and cash equivalents | Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. broad market | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 64 | 51 |
U.S. broad market | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
U.S. broad market | Significant Other Observable Inputs (Level 2) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 64 | 51 |
U.S. broad market | Significant Unobservable Inputs (Level 3) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Emerging markets | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 15 | 13 |
Emerging markets | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 2 | 1 |
Emerging markets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Emerging markets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Emerging markets | Significant Other Observable Inputs (Level 2) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 15 | 13 |
Emerging markets | Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 2 | 1 |
Emerging markets | Significant Unobservable Inputs (Level 3) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Emerging markets | Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Worldwide developed markets | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 26 | 21 |
Worldwide developed markets | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 38 | 29 |
Worldwide developed markets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Worldwide developed markets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Worldwide developed markets | Significant Other Observable Inputs (Level 2) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 26 | 21 |
Worldwide developed markets | Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 38 | 29 |
Worldwide developed markets | Significant Unobservable Inputs (Level 3) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Worldwide developed markets | Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other assets | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 15 | 13 |
Other assets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other assets | Significant Other Observable Inputs (Level 2) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 15 | 13 |
Other assets | Significant Unobservable Inputs (Level 3) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment grade | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 95 | 87 |
Investment grade | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Investment grade | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment grade | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment grade | Significant Other Observable Inputs (Level 2) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 95 | 87 |
Investment grade | Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Investment grade | Significant Unobservable Inputs (Level 3) | Recurring basis | United States |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Investment grade | Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Global high yield | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 3 | 2 |
Global high yield | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Global high yield | Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 3 | 2 |
Global high yield | Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Government bond funds | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 91 | 90 |
Government bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 1 | 0 |
Government bond funds | Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 90 | 90 |
Government bond funds | Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other assets | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 9 | 9 |
Other assets | Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Other assets | Significant Other Observable Inputs (Level 2) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | 8 | 9 |
Other assets | Significant Unobservable Inputs (Level 3) | Recurring basis | Ireland and Japan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Fair value of plan assets | $ 1 | $ 0 |

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -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 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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