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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amortization of: |  |  |
Actuarial (gain) loss | $ (569) |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 1,525 |  |
Pension Benefits | U.S. Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 1,543 | $ 1,412 | $ 1,527
Interest cost | 1,813 | 1,828 | 1,694
Expected return on assets | (2,883) | (2,516) | (2,489)
Amortization of: |  |  |
Amortization of prior service cost | 192 | 166 | 168
Actuarial (gain) loss | 729 | 2,520 | 70
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 | 0
Net periodic benefit cost | 1,394 | 3,410 | 970
Pension Benefits | International Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 60 | 49 | 48
Interest cost | 40 | 41 | 44
Expected return on assets | (66) | (58) | (61)
Amortization of: |  |  |
Amortization of prior service cost | 1 | 1 | 1
Actuarial (gain) loss | 18 | 114 | 31
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 2 | 0 | 0
Net periodic benefit cost | 55 | 147 | 63
Postemployment Retirement Benefits | U.S. Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 29 | 28 | 34
Interest cost | 112 | 124 | 117
Expected return on assets | (7) | (6) | (17)
Amortization of: |  |  |
Amortization of prior service cost | 7 | 5 | 5
Actuarial (gain) loss | 53 | 17 | 17
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment | 0 | 0 | 0
Net periodic benefit cost | $ 194 | $ 168 | $ 156

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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