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EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Defined Benefit Pension Plan | U.S. Pension Benefits |  |  |  |
Net Periodic Cost: |  |  |  |
Service cost | $ 442 | $ 463 | $ 1,456 | $ 1,390
Interest cost | 490 | 495 | 1,459 | 1,483
Expected return on assets | (825) | (887) | (2,502) | (2,662)
Amortization of prior service cost | 36 | 55 | 103 | 164
Actuarial (gain) loss |  |  | (3,290) | 0
Net periodic benefit cost | 143 | 126 | (2,774) | 375
Defined Benefit Pension Plan | International Pension Benefits |  |  |  |
Net Periodic Cost: |  |  |  |
Service cost | 19 | 17 | 57 | 50
Interest cost | 9 | 10 | 29 | 30
Expected return on assets | (17) | (22) | (51) | (64)
Amortization of prior service cost | 0 | 0 | 1 | 1
Actuarial (gain) loss |  |  | 0 | 0
Net periodic benefit cost | 11 | 5 | 36 | 17
U.S. Postretirement Medical Benefits | U.S. Pension Benefits |  |  |  |
Net Periodic Cost: |  |  |  |
Service cost | 7 | 7 | 21 | 22
Interest cost | 21 | 23 | 60 | 68
Expected return on assets | (1) | (2) | (4) | (6)
Amortization of prior service cost | 2 | 1 | 5 | 5
Actuarial (gain) loss |  |  | 0 | 0
Net periodic benefit cost | 29 | $ 29 | 82 | $ 89
Estimated future employer contributions to defined benefit plan, current fiscal year | $ 21,000 |  | $ 21,000 |

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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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