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EMPLOYEE BENEFIT PLANS - Pension Plan (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Service cost	$ 8	$ 8
Interest cost	13	17
Expected return on plan assets	(35)	(39)
Amortization of prior service credit	1	1
Recognized actuarial net loss	5	2
Net settlement, curtailment and special termination benefit loss	1	0
Total net periodic benefit (income) cost	$ (7)	$ (11)

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