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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | 6 Months Ended
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Jun. 30, 2020
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS | PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS The following is a summary of net periodic benefit cost relating to our pension and OPEB plans.
| Three months ended June 30, |  |  | Six months ended June 30, |
|  | As Restated |  |  | As Restated
(in millions) | 2020 | 2019 |  | 2020 | 2019
Pension benefits |  |  |  |  |
Service cost | $ | 20 |  | $ | 20 |  |  | $ | 41 |  | $ | 38 |
Interest cost | 23 |  | 43 |  |  | 47 |  | 90 |
Expected return on plan assets | (40) |  | (68) |  |  | (81) |  | (140) |
Amortization of net losses and prior service costs | 19 |  | 14 |  |  | 38 |  | 29 |
Net periodic pension benefit cost | $ | 22 |  | $ | 9 |  |  | $ | 45 |  | $ | 17 |
OPEB |  |  |  |  |
Interest cost | $ | 1 |  | $ | 2 |  |  | $ | 2 |  | $ | 4 |
Amortization of net loss and prior service credit | (4) |  | (7) |  |  | (8) |  | (14) |
Net periodic OPEB cost (income) | $ | (3) |  | $ | (5) |  |  | $ | (6) |  | $ | (10) |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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