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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Document Fiscal Year Focus | 2015 |  |
U.S. Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | $ 1,527 | $ 1,137 | $ 1,349
Interest cost | 1,694 | 1,604 | 1,449
Expected return on assets | (2,489) | (2,257) | (2,147)
Amortization of: |  |  |
Transition obligation | 0 | 0 | 0
Prior service cost | 168 | 169 | 172
Actuarial (gain) loss | 70 | 991 | 0
Curtailment and settlement loss | 0 | 0 | 0
Defined Benefit Plan, Curtailments | 0 | 0 | 0
Net periodic benefit cost | 970 | 1,644 | 823
U.S. Postretirement Medical Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 34 | 62 | 103
Interest cost | 117 | 152 | 185
Expected return on assets | (17) | (25) | (33)
Amortization of: |  |  |
Transition obligation | 0 | 0 | 0
Prior service cost | 5 | 0 | 4
Actuarial (gain) loss | 17 | 767 | 0
Curtailment and settlement loss | 0 | 0 | 0
Defined Benefit Plan, Curtailments | 0 | 356 | 0
Net periodic benefit cost | 156 | 1,312 | 259
International Pension Benefits |  |  |
Net Periodic Benefit Cost: |  |  |
Service cost | 48 | 43 | 47
Interest cost | 44 | 49 | 44
Expected return on assets | (61) | (61) | (55)
Amortization of: |  |  |
Transition obligation | 0 | 0 | 0
Prior service cost | 1 | 1 | 2
Actuarial (gain) loss | 31 | 48 | 0
Curtailment and settlement loss | 0 | 4 | (5)
Defined Benefit Plan, Curtailments | 0 | 0 | 0
Net periodic benefit cost | $ 63 | $ 84 | $ 33

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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=58740216&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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