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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Company Sponsored Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits | United States |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | $ 1,439 | $ 1,661 | $ 1,543
Interest cost | 2,067 | 1,799 | 1,813
Expected return on assets | (3,130) | (3,201) | (2,883)
Amortization of: |  |  |
Amortization of prior service cost | 218 | 193 | 192
Actuarial (gain) loss | 2,296 | 1,603 | 729
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 | 0
Net periodic benefit cost | 2,890 | 2,055 | 1,394
Pension Benefits | International Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 57 | 62 | 60
Interest cost | 47 | 45 | 40
Expected return on assets | (76) | (77) | (66)
Amortization of: |  |  |
Amortization of prior service cost | 2 | 1 | 1
Actuarial (gain) loss | 54 | 24 | 18
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 | 2
Net periodic benefit cost | 84 | 55 | 55
Postemployment Retirement Benefits | United States |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 23 | 29 | 29
Interest cost | 108 | 104 | 112
Expected return on assets | (8) | (8) | (7)
Amortization of: |  |  |
Amortization of prior service cost | 7 | 7 | 7
Actuarial (gain) loss | 37 | 0 | 53
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 | 0
Net periodic benefit cost | $ 167 | $ 132 | $ 194

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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