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PENSION AND OTHER POSTEMPLOYMENT BENEFITS - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost   $ 140 $ 139 $ 184
Interest cost   398 428 273
Expected return on plan assets   (530) (570) (657)
Amortization of prior service costs (credits)   2 2 2
Special termination benefits   0 21 0
Pension & OPEB mark-to-market $ (59) 66 108 (98)
Net periodic benefit costs (credits)   76 128 (296)
OPEB        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost   3 2 3
Interest cost   20 21 11
Expected return on plan assets   (35) (31) (39)
Amortization of prior service costs (credits)   (1) (8) (11)
Special termination benefits   0 8 0
Pension & OPEB mark-to-market   (44) (30) 26
Net periodic benefit costs (credits)   $ (57) $ (38) $ (10)