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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS (Tables) | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Net Periodic Benefit Cost Relating to Pension and Other Postemployment Employee Benefit Plans | The following is a summary of net periodic benefit cost relating to our pension and OPEB plans.
| Three months ended September 30, |  | Nine months ended September 30,
(in millions) | 2021 | 2020 |  | 2021 | 2020
Pension benefits |  |  |  |  |
Service cost | $ | 22 |  | $ | 20 |  |  | $ | 66 |  | $ | 61 |
Interest cost | 18 |  | 24 |  |  | 54 |  | 71 |
Expected return on plan assets | (36) |  | (40) |  |  | (108) |  | (121) |
Amortization of net losses and prior service costs | 23 |  | 19 |  |  | 69 |  | 57 |
Net periodic pension cost | $ | 27 |  | $ | 23 |  |  | $ | 81 |  | $ | 68 |
OPEB |  |  |  |  |
Interest cost | $ | 1 |  | $ | 2 |  |  | $ | 3 |  | $ | 4 |
Amortization of net loss and prior service credit | (2) |  | (5) |  |  | (7) |  | (13) |
Net periodic OPEB cost (income) | $ | (1) |  | $ | (3) |  |  | $ | (4) |  | $ | (9) |

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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=123447040&loc=d3e1928-114920 + Details
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