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EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2018
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 and six months ended June 30, 2018 and 2017 (in millions):
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Three Months Ended June 30: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 415 |  |  | $ | 389 |  |  | $ | 7 |  |  | $ | 7 |  |  | $ | 16 |  |  | $ | 14 |
Interest cost | 450 |  |  | 462 |  |  | 26 |  |  | 28 |  |  | 11 |  |  | 10 |
Expected return on assets | (800 | ) |  | (712 | ) |  | (2 | ) |  | (1 | ) |  | (19 | ) |  | (16 | )
Amortization of prior service cost | 48 |  |  | 48 |  |  | 2 |  |  | 2 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 113 |  |  | $ | 187 |  |  | $ | 33 |  |  | $ | 36 |  |  | $ | 8 |  |  | $ | 8 |
| U.S. Pension Benefits |  | U.S. Postretirement Medical Benefits |  | International Pension Benefits
2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Six Months Ended June 30: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 831 |  |  | $ | 779 |  |  | $ | 14 |  |  | $ | 14 |  |  | $ | 32 |  |  | $ | 29 |
Interest cost | 899 |  |  | 924 |  |  | 52 |  |  | 56 |  |  | 23 |  |  | 20 |
Expected return on assets | (1,601 | ) |  | (1,424 | ) |  | (4 | ) |  | (3 | ) |  | (39 | ) |  | (32 | )
Amortization of prior service cost | 97 |  |  | 96 |  |  | 4 |  |  | 4 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 226 |  |  | $ | 375 |  |  | $ | 66 |  |  | $ | 71 |  |  | $ | 16 |  |  | $ | 17 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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