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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 3,174 | $ (4,441) |
Fair value of plan assets at beginning of year | 43,448 |  |
Fair value of plan assets at end of year | 40,864 | 43,448 |
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 | 45,333 | 37,113 |
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 44,284 | 35,538 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 39,554 | 32,914 |
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 45,333 | 37,113 |
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 44,284 | 35,538 |
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 39,554 | 32,914 |
Projected benefit obligation at beginning of year | 45,847 | 41,069 |
Service cost | 1,661 | 1,543 | $ 1,412
Interest cost | 1,799 | 1,813 | 1,828
Gross benefits paid | (1,390) | (1,309) |
Plan participants’ contributions | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 331 | 0 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 2,915 | (4,256) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | 0 | 1,525 |
Defined Benefit Plan Other Benefit Obligations | 0 | 0 |
Projected benefit obligation at end of year | 45,333 | 45,847 | 41,069
Fair value of plan assets at beginning of year | 41,932 | 31,215 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (1,007) | 4,717 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 19 | 7,309 |
Gross benefits paid | (1,390) | (1,309) |
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 | 39,554 | 41,932 | 31,215
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 | 630 | 1,138 |
Accumulated benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | 539 | 992 |
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 339 | 798 |
Projected benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 630 | 647 |
Accumulated benefit obligation, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 539 | 549 |
Fair value of plan assets, Accumulated Benefit Obligation Exceeds the Fair Value of Plan Assets | 339 | 342 |
Projected benefit obligation at beginning of year | 1,651 | 1,425 |
Service cost | 62 | 60 | 49
Interest cost | 45 | 40 | 41
Gross benefits paid | (33) | (32) |
Plan participants’ contributions | 3 | 3 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 13 | 0 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 81 | (26) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | (110) | 129 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | 1 | 3 |
Defined Benefit Plan Other Benefit Obligations | 3 | 3 |
Projected benefit obligation at end of year | 1,552 | 1,651 | 1,425
Fair value of plan assets at beginning of year | 1,333 | 1,092 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (6) | 96 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 80 | 77 |
Gross benefits paid | (33) | (32) |
Plan participants’ contributions | 3 | 3 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | (92) | 100 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | 1 | 3 |
Fair value of plan assets at end of year | 1,284 | 1,333 | 1,092
Postemployment Retirement Benefits | U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation at beginning of year | 2,792 | 2,730 |
Service cost | 29 | 29 | 28
Interest cost | 104 | 112 | 124
Gross benefits paid | (263) | (264) |
Plan participants’ contributions | 26 | 26 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 178 | (159) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement | 0 | 0 |
Defined Benefit Plan Other Benefit Obligations | 0 | 0 |
Projected benefit obligation at end of year | 2,510 | 2,792 | 2,730
Fair value of plan assets at beginning of year | 183 | 15 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | (7) | (2) |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 87 | 408 |
Gross benefits paid | (263) | (264) |
Plan participants’ contributions | 26 | 26 |
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 | $ 26 | $ 183 | $ 15

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -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 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 (b)(8) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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