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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosures [Line Items] |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year | $ 250 |  | $ 250 |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 89 |
Service cost | 99 | $ 96 | 198 | $ 198
Interest cost | 171 | 150 | 342 | 293
Expected return on plan assets | 423 | 435 | 847 | 857
Amortization of prior service credit | (5) | (5) | (11) | (10)
Defined Benefit Plan, Amortization of (Gain) Loss | 165 | 200 | 332 | 424
Curtailment gain | 0 | 0 | 0 | (19)
Net periodic benefit cost | 7 | 6 | 14 | 29
Other Postretirement Benefits [Member] |  |  |  |
Defined Benefit Plan Disclosures [Line Items] |  |  |  |
Service cost | 2 | 2 | 3 | 4
Interest cost | 7 | 5 | 14 | 11
Defined Benefit Plan, Amortization of (Gain) Loss | (4) | (1) | (8) | (3)
Net periodic benefit cost | $ 5 | $ 6 | $ 9 | $ 12

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