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