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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 04, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
OPEB contributions |  | $ 22 |  | $ 27 |
Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | 14 | $ 5 | 42 | $ 16
Interest cost |  | 26 | 20 | 78 | 43
Expected return on plan assets |  | (89) | (38) | (269) | (93)
Prior service credits |  | 1 | 1 | 1 | 1
Net actuarial loss |  | 8 | 8 | 24 | 21
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total |  | (40) | (4) | (124) | (12)
Defined benefit pension contributions | $ 118 | 1 | 1 | 154 | 5
Other Postretirement Benefit Plans, Defined Benefit |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | 13 | 1 | 38 | 3
Interest cost |  | 19 | 4 | 56 | 11
Expected return on plan assets |  | (10) | (4) | (30) | (13)
Prior service credits |  | (2) | (1) | (2) | (2)
Net actuarial loss |  | 1 | 1 | 3 | 2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total |  | $ 21 | 1 | $ 65 | 1
OPEB contributions |  |  | $ 0 |  | $ 0

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