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PENSIONS AND OTHER POSTRETIREMENT BENEFITS (Tables) | 3 Months Ended
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Mar. 31, 2021
Postemployment Benefits [Abstract] |
Schedule of Net Benefit Costs | The following are the components of defined benefit pension and OPEB costs (credits): Defined Benefit Pension Costs (Credits)
|  |  |  |  | (In Millions)
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Service cost |  |  |  |  | $ | 14 |  |  | $ | 5 |
Interest cost |  |  |  |  | 26 |  |  | 8 |
Expected return on plan assets |  |  |  |  | (90) |  |  | (18) |
Amortization: |  |  |  |  |  |  |
Net actuarial loss |  |  |  |  | 8 |  |  | 7 |
Net periodic benefit cost (credit) |  |  |  |  | $ | (42) |  |  | $ | 2 |
OPEB Costs (Credits)
|  |  |  |  | (In Millions)
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Service cost |  |  |  |  | $ | 13 |  |  | $ | 1 |
Interest cost |  |  |  |  | 18 |  |  | 2 |
Expected return on plan assets |  |  |  |  | (10) |  |  | (5) |
Amortization: |  |  |  |  |  |  |
Prior service credits |  |  |  |  | — |  |  | (1) |
Net actuarial loss |  |  |  |  | 1 |  |  | 1 |
Net periodic benefit cost (credit) |  |  |  |  | $ | 22 |  |  | $ | (2) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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