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, 2022	Dec. 31, 2021
Qualified Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets as of January 1	$ 1,390	$ 1,343
Actual return on plan assets	(262)	125
Employer contributions	0	0
Benefits and administrative expenses paid	(76)	(78)
Fair value of plan assets from Investors acquisition	130	0
Fair value of plan assets as of December 31	1,182	1,390
Projected benefit obligation	868	1,083
Pension asset (obligation)	314	307
Accumulated benefit obligation	868	1,083
Non-Qualified Plans
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 from Investors acquisition	0	0
Fair value of plan assets as of December 31	0	0
Projected benefit obligation	94	99
Pension asset (obligation)	(94)	(99)
Accumulated benefit obligation	$ 94	$ 99