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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Years of service used in determining benefits		5 years
Net actuarial losses		$ 571	$ 551
Employer matching contribution percentage	100.00%
Employer matching contribution, Percent of employees' pay	4.00%
Employer matching contribution, addition		2.00%
Employer contribution amount		$ 78	72	$ 68
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions		0	0
Expected contribution		0
Non-Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions		8	$ 8
Expected contribution		$ 8

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