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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets for Pension Plans With an Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 956 |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 8 | $ 0 |
Pension Benefits | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 37,113 | 41,069 |
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 35,538 | 38,194 |
Fair value of plan assets, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 32,914 | 31,215 |
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 37,113 | 41,069 |
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 35,538 | 38,194 |
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 32,914 | 31,215 |
Projected benefit obligation at beginning of year | 41,069 | 36,846 |
Service cost | 1,543 | 1,412 | $ 1,527
Interest cost | 1,813 | 1,828 | 1,694
Gross benefits paid | (1,309) | (1,885) |
Plan participants’ contributions | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 285 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (4,256) | (2,583) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements | 1,525 | 0 |
Defined Benefit Plan Other Benefit Obligations | 0 | 0 |
Projected benefit obligation at end of year | 45,847 | 41,069 | 36,846
Fair value of plan assets at beginning of year | 31,215 | 28,887 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 4,717 | 1,735 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 7,309 | 2,478 |
Gross benefits paid | (1,309) | (1,885) |
Plan participants’ contributions | 0 | 0 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0 | 0 |
Fair value of plan assets at end of year | 41,932 | 31,215 | 28,887
Pension Benefits | International Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 1,138 | 1,370 |
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 992 | 1,238 |
Fair value of plan assets, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 798 | 1,020 |
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 647 | 1,365 |
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 549 | 1,234 |
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 342 | 1,016 |
Projected benefit obligation at beginning of year | 1,425 | 1,219 |
Service cost | 60 | 49 | 48
Interest cost | 40 | 41 | 44
Gross benefits paid | (32) | (28) |
Plan participants’ contributions | 3 | 3 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (26) | (208) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 129 | (67) |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements | 3 | 3 |
Defined Benefit Plan Other Benefit Obligations | 3 | 3 |
Projected benefit obligation at end of year | 1,651 | 1,425 | 1,219
Fair value of plan assets at beginning of year | 1,092 | 1,014 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 96 | 108 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 77 | 71 |
Gross benefits paid | (32) | (28) |
Plan participants’ contributions | 3 | 3 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 100 | (73) |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 3 | 3 |
Fair value of plan assets at end of year | 1,333 | 1,092 | 1,014
Postemployment Retirement Benefits | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation at beginning of year | 2,730 | 2,673 |
Service cost | 29 | 28 | 34
Interest cost | 112 | 124 | 117
Gross benefits paid | (264) | (264) |
Plan participants’ contributions | 26 | 27 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 15 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (159) | (126) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements | 0 | 0 |
Defined Benefit Plan Other Benefit Obligations | 0 | 1 |
Projected benefit obligation at end of year | 2,792 | 2,730 | 2,673
Fair value of plan assets at beginning of year | 15 | 130 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (2) | 3 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 408 | 119 |
Gross benefits paid | (264) | (264) |
Plan participants’ contributions | 26 | 27 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 0 | 0 |
Fair value of plan assets at end of year | $ 183 | $ 15 | $ 130

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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