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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail) Employee in Thousands, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2007 USD ($) | Dec. 31, 2016 USD ($) Employee | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan net actuarial loss |  |  | $ 3,174 | $ (4,441) |
Discount rate |  |  | 4.45% | 3.81% | 4.34%
Actuarial Gain Loss Corridor Threshold |  | 10.00% |  |  | 10.00%
Return on plan assets |  |  | 2.75% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Target Award Maximum, Percentage |  |  | 200.00% |  |
Number of covered persons | Employee |  | 22 |  |  | 22
Pension and postretirement benefit expense |  |  | $ 2,242 | $ 1,643 | $ 3,725
Health care cost trends, initial annual rate increase |  |  | 6.00% |  |
Health care cost trends, an ultimate trend rate |  |  | 4.50% |  |
Expected year when ultimate trend rate to be reached |  |  | 2022 |  |
Accumulated benefit obligation for pension plans |  |  | $ 45,704 | 45,776 |
Employer contributions |  | $ 685 | 186 | 7,794 | 2,668
Fair value of plan assets |  |  | $ 40,864 | $ 43,448 |
Plan assets target allocation |  |  | 100.00% | 100.00% |
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | $ 23 | $ 22 |
U.S. Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Discount rate |  |  | 0.32% |  |
Postretirement Medical Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer contributions |  |  | $ 87 | 93 |
Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 39,580 | 42,115 |
Domestic | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 157 | 5,725 |
International Package |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 1,284 | 1,333 |
International Package | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 45 | 78 |
Fixed Income Securities [Member] | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 16,669 | 11,634 |
Fixed Income Securities [Member] | International Package |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 324 | 301 |
Equity securities | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 13,667 | 16,224 |
Equity securities | International Package |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 586 | 637 |
Other Investments [Member] | Private Equity and Real Estate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unfunded commitments to limited partnerships |  |  | 2,090 |  |
Other Investments [Member] | Domestic | Hedge Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 3,154 | 2,910 |
Other Investments [Member] | Domestic | Risk Parity Funds [Domain] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 207 | 359 |
Other Investments [Member] | Domestic | Structured Products |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 1,989 | 2,031 |
Other Investments [Member] | Domestic | Structured Products [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 138 |  |
Other Investments [Member] | International Package | Other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 208 | 193 |
Other Investments [Member] | International Package | Structured Products |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  |  | 121 | 124 |
Employee Defined Contribution Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions charged to expense |  |  | 127 | 119 | 111
Pension and postretirement benefit expense |  |  | 28 | 23 | 4
Defined Contribution Money Purchase Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions charged to expense |  |  | $ 92 | $ 91 | $ 82
Discounted Employee Stock Purchase Modified Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Exercisable Price Percentage Of Closing Price Of Another Class Of Stock |  |  | 95.00% |  |
Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 3.00% |  |
Minimum | U.S. Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Postretirement medical plans service minimum eligibility year |  |  | 10 years | 10 years |
Postretirement medical plans service minimum eligibility age |  |  | 55 years |  |
Minimum | Domestic | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 0.00% | 0.00% |
Minimum | International Package | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 1.00% | 0.00% |
Minimum | Fixed Income Securities [Member] | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 35.00% | 25.00% |
Minimum | Fixed Income Securities [Member] | International Package |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 25.00% | 25.00% |
Minimum | Equity securities | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 25.00% | 35.00% |
Minimum | Equity securities | International Package |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 30.00% | 30.00% |
Minimum | Other Investments [Member] | Private Equity and Real Estate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Redemption notice period, lower limit |  |  | 10 years |  |
Minimum | Other Investments [Member] | Domestic | Hedge Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 5.00% | 5.00% |
Minimum | Other Investments [Member] | Domestic | Other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 1.00% | 1.00% |
Minimum | Other Investments [Member] | Domestic | Structured Products |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 1.00% | 1.00% |
Minimum | Other Investments [Member] | Domestic | Structured Products [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 1.00% | 0.00% |
Minimum | Other Investments [Member] | International Package | Other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 1.00% | 0.00% |
Minimum | Other Investments [Member] | International Package | Structured Products |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 5.00% | 5.00% |
Minimum | Other Investments [Member] | International Package | Structured Products [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 0.00% | 0.00% |
Minimum | Employee Defined Contribution Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 5.00% |  |
Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 8.00% |  |
Maximum | Domestic | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 5.00% | 5.00% |
Maximum | International Package | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 10.00% | 10.00% |
Maximum | Fixed Income Securities [Member] | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 55.00% | 35.00% |
Maximum | Fixed Income Securities [Member] | International Package |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 45.00% | 50.00% |
Maximum | Equity securities | Domestic |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 55.00% | 55.00% |
Maximum | Equity securities | International Package |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 60.00% | 60.00% |
Maximum | Other Investments [Member] | Private Equity and Real Estate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Redemption notice period, upper limit |  |  | 15 years |  |
Maximum | Other Investments [Member] | Domestic | Hedge Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 15.00% | 15.00% |
Maximum | Other Investments [Member] | Domestic | Other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 10.00% | 10.00% |
Maximum | Other Investments [Member] | Domestic | Structured Products |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 10.00% | 10.00% |
Maximum | Other Investments [Member] | Domestic | Structured Products [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 5.00% | 5.00% |
Maximum | Other Investments [Member] | International Package | Other |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 20.00% | 20.00% |
Maximum | Other Investments [Member] | International Package | Structured Products |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 10.00% | 10.00% |
Maximum | Other Investments [Member] | International Package | Structured Products [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum (Deprecated 2017-01-31) |  |  | 10.00% | 0.00% |
Maximum | Employee Defined Contribution Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  | 8.00% |  |
Multiemployer Plans, Pension | Central States, South East & South West Areas Health and Welfare Fund |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan net actuarial loss |  |  | $ 1,550 |  |
Multiemployer Plans, Withdrawal Obligation | $ 6,100 |  |  |  |
Increase in benefit obligation |  |  | 1,600 |  |
Pension obligations |  |  | 4,000 |  |
Adjustments |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan, actuarial gain |  |  |  | $ 569 |
Defined benefit plan, curtailment |  |  |  | 1,525 |
Defined benefit plan net actuarial loss |  |  |  | 956 |
Pro Forma | Multiemployer Plans, Pension | Maximum | Central States, South East & South West Areas Health and Welfare Fund |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Increase in benefit obligation |  |  | 2,400 |  |
Defined Benefit Plan, Actuarial Assumptions Discount Rate |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan net actuarial loss |  |  | 4,829 | 4,124 |
Defined Benefit Plan, Actuarial Assumptions Demographic and Assumption Changes [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined benefit plan net actuarial loss |  |  | $ (105) | $ (317) |

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