Quarterly report pursuant to Section 13 or 15(d)

PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details)

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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 8 $ 11 $ 24 $ 35
Interest cost 59 32 176 95
Expected return on plan assets (79) (93) (236) (277)
Prior service costs (credits) 5 1 13 1
Net actuarial loss (gain) 0 4 2 11
Net periodic benefit costs (credits) (7) (45) (21) (135)
Defined benefit pension contributions 0 1 0 1
Other Postretirement Benefit Plans, Defined Benefit        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 2 11 7 32
Interest cost 15 19 47 59
Expected return on plan assets (10) (10) (31) (29)
Prior service costs (credits) (4) 1 (12) 1
Net actuarial loss (gain) (36) (3) (109) (9)
Net periodic benefit costs (credits) (33) 18 (98) 54
OPEB contributions $ 0 $ 24 $ 0 $ 80