INTANGIBLE ASSETS AND GOODWILL - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Expected aggregate future amortization expense of intangible assets for 2021	$ 102
Expected aggregate future amortization expense of intangible assets for 2022	102
Expected aggregate future amortization expense of intangible assets for 2023	102
Expected aggregate future amortization expense of intangible assets for 2024	$ 102
Minimum
Finite-Lived Intangible Assets [Line Items]
Range of amortization life of intangible assets	15 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Range of amortization life of intangible assets	30 years
Contracts acquired in business combinations and other
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 105	$ 111	$ 116
Expected aggregate future amortization expense of intangible assets for 2020	$ 102