EMPLOYEE RETIREMENT PLANS - Defined-benefit Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Qualified
Information for the defined-benefit pension plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	$ 174	$ 1,100
Accumulated benefit obligation	174	1,100
Fair value of plan assets	94	844
Non-Qualified
Information for the defined-benefit pension plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	148	162
Accumulated benefit obligation	148	162
Fair value of plan assets	$ 0	$ 0