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EMPLOYEE BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | Information about net periodic benefit cost for our company-sponsored pension and postretirement benefit plans is as follows for the three months ended March 31, 2019 and 2018 (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Three Months Ended March 31: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 359 |  |  | $ | 416 |  |  | $ | 6 |  |  | $ | 7 |  |  | $ | 14 |  |  | $ | 16 |
Interest cost | 517 |  |  | 449 |  |  | 27 |  |  | 26 |  |  | 12 |  |  | 12 |
Expected return on assets | (782 | ) |  | (801 | ) |  | (2 | ) |  | (2 | ) |  | (19 | ) |  | (20 | )
Amortization of prior service cost | 54 |  |  | 49 |  |  | 2 |  |  | 2 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 148 |  |  | $ | 113 |  |  | $ | 33 |  |  | $ | 33 |  |  | $ | 7 |  |  | $ | 8 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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