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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits | U.S. Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | $ 1,661 | $ 1,543 | $ 1,412
Interest cost | 1,799 | 1,813 | 1,828
Expected return on assets | (3,201) | (2,883) | (2,516)
Amortization of: |  |  |
Amortization of prior service cost | 193 | 192 | 166
Actuarial (gain) loss | 1,603 | 729 | 2,520
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 | 0
Net periodic benefit cost | 2,055 | 1,394 | 3,410
Pension Benefits | International Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 62 | 60 | 49
Interest cost | 45 | 40 | 41
Expected return on assets | (77) | (66) | (58)
Amortization of: |  |  |
Amortization of prior service cost | 1 | 1 | 1
Actuarial (gain) loss | 24 | 18 | 114
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 2 | 0
Net periodic benefit cost | 55 | 55 | 147
Postemployment Retirement Benefits | U.S. Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 29 | 29 | 28
Interest cost | 104 | 112 | 124
Expected return on assets | (8) | (7) | (6)
Amortization of: |  |  |
Amortization of prior service cost | 7 | 7 | 5
Actuarial (gain) loss | 0 | 53 | 17
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 | 0
Net periodic benefit cost | $ 132 | $ 194 | $ 168

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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=108410482&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=112275985&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=108410482&loc=d3e2709-114920 + Details
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