RETIREMENT BENEFITS PLANS - Components of Pension Plans with Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) - Pension plans - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
United States
Components of pension plans with an accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	$ 131	$ 4,054
Fair value of plan assets	0	3,463
Components of pension plans with a projected benefit obligation in excess of plan assets
Projected benefit obligation	147	4,121
Fair value of plan assets	0	3,463
Foreign Plan
Components of pension plans with an accumulated benefit obligation in excess of plan assets
Accumulated benefit obligation	894	2,586
Fair value of plan assets	207	1,756
Components of pension plans with a projected benefit obligation in excess of plan assets
Projected benefit obligation	1,290	2,763
Fair value of plan assets	$ 521	$ 1,770