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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Mark-to-market adjustment, net of capitalized amounts $ 54 $ 423 $ (382) $ 477 $ 676
Discontinued Operations          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Mark-to-market adjustment, net of capitalized amounts         2
Pension          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost     195 194 193
Interest cost     226 287 373
Expected return on plan assets     (652) (618) (540)
Amortization of prior service costs (credits)     3 12 7
Special termination costs     0 0 14
One-time termination benefits     0 8 0
Pension & OPEB mark-to-market Adjustment     (253) 463 656
Net periodic benefit costs (credits)     (481) 346 703
Net accelerated credits   $ 18      
OPEB          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost     4 4 3
Interest cost     11 15 22
Expected return on plan assets     (36) (33) (29)
Amortization of prior service costs (credits)     (17) (46) (36)
Special termination costs     0 0 0
One-time termination benefits     0 0 0
Pension & OPEB mark-to-market Adjustment     (129) 14 20
Net periodic benefit costs (credits)     $ (167) $ (46) $ (20)