EMPLOYEE BENEFITS - Changes in the Fair Value of Pension Plan Assets, Projected Benefit Obligation, Funded Status, and Accumulated Benefit Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Qualified Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets as of January 1	$ 1,343	$ 1,246
Actual return on plan assets	125	165
Employer contributions	0	0
Benefits and administrative expenses paid	(78)	(68)
Fair value of plan assets as of December 31	1,390	1,343
Projected benefit obligation	1,083	1,157
Pension asset (obligation)	307	186
Accumulated benefit obligation	1,083	1,157
Non-Qualified Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets as of January 1	0	0
Actual return on plan assets	0	0
Employer contributions	8	8
Benefits and administrative expenses paid	(8)	(8)
Fair value of plan assets as of December 31	0	0
Projected benefit obligation	99	105
Pension asset (obligation)	(99)	(105)
Accumulated benefit obligation	$ 99	$ 105