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EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |  |
Net Periodic Cost: |  |  |  |
Service cost | $ 461 | $ 463 | $ 1,014 | $ 927
Interest cost | 481 | 494 | 969 | 988
Expected return on assets | (831) | (887) | (1,677) | (1,775)
Amortization of prior service cost | 34 | 54 | 67 | 109
Actuarial (gain) loss |  |  | (3,290) | 0
Net periodic benefit cost | 145 | 124 | (2,917) | 249
Estimated future employer contributions to defined benefit plan, current fiscal year | 31,000 |  | 31,000 |
Defined Benefit Pension Plan | International Pension Benefits |  |  |  |
Net Periodic Cost: |  |  |  |
Service cost | 19 | 17 | 38 | 33
Interest cost | 10 | 10 | 20 | 20
Expected return on assets | (17) | (21) | (34) | (42)
Amortization of prior service cost | 1 | 1 | 1 | 1
Actuarial (gain) loss |  |  | 0 | 0
Net periodic benefit cost | 13 | 7 | 25 | 12
U.S. Postretirement Medical Benefits | U.S. Pension Benefits |  |  |  |
Net Periodic Cost: |  |  |  |
Service cost | 7 | 8 | 14 | 15
Interest cost | 20 | 22 | 39 | 45
Expected return on assets | (1) | (2) | (3) | (4)
Amortization of prior service cost | 1 | 2 | 3 | 4
Actuarial (gain) loss |  |  | 0 | 0
Net periodic benefit cost | 27 | $ 30 | 53 | $ 60
Estimated future employer contributions to defined benefit plan, current fiscal year | $ 43,000 |  | $ 43,000 |

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- Definition Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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