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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) Employee shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) Employee $ / shares shares | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan net actuarial loss |  |  |  |  |  |  |  |  | $ (10,100,000,000) | $ (8,000,000,000.0) |
Service cost discount rate |  |  |  |  |  |  |  |  | 2.87% | 3.55% | 4.45%
Number of covered persons | Employee |  |  |  |  | 18,800 |  |  |  |  | 18,800 |
Lump Sum Pension Payments |  |  |  |  | $ 820,000,000 |  |  |  |  |  |
Health care cost trends, initial annual rate increase | 6.50% |  |  |  |  |  |  |  | 6.50% |  |
Health care cost trends, an ultimate trend rate | 4.50% |  |  |  |  |  |  |  | 4.50% |  |
Employer contributions |  |  |  |  |  |  |  |  | $ 3,125,000,000 | $ 2,362,000,000 | $ 186,000,000
Fair value of plan assets | $ 54,881,000,000 |  |  |  | 47,767,000,000 |  |  |  | 54,881,000,000 | 47,767,000,000 |
Decreas in projected benefit obligation |  |  |  |  |  |  |  |  |  | 900,000,000 |
Change in unrecognized pension and postretirement benefit costs, net of tax |  |  |  |  |  |  |  |  | 880,000,000 | 1,129,000,000 | (272,000,000)
Net Income | $ (3,347,000,000) | $ 1,957,000,000 | $ 1,768,000,000 | $ 965,000,000 | $ (106,000,000) | $ 1,750,000,000 | $ 1,685,000,000 | $ 1,111,000,000 | $ 1,343,000,000 | $ 4,440,000,000 | 4,791,000,000
Common stock held in plan assets (in shares) | shares | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Pension and postretirement benefit expense |  |  |  |  |  |  |  |  | $ 7,125,000,000 | $ 3,141,000,000 | 2,242,000,000
Pension and postretirement benefit expense |  |  |  |  |  |  |  |  | 7,125,000,000 | 3,141,000,000 | 2,242,000,000
Private Equity and Real Estate | Other Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unfunded commitments to limited partnerships | $ 3,300,000,000 |  |  |  |  |  |  |  | 3,300,000,000 |  |
Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated benefit obligation for pension plans | 66,900,000,000 |  |  |  | $ 55,000,000,000.0 |  |  |  | 66,900,000,000 | 55,000,000,000.0 |
Employer contributions |  |  |  |  |  |  |  |  | 26,000,000 | 27,000,000 |
Postretirement Medical Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  |  |  |  | 77,000,000 | 82,000,000 |
Postemployment Retirement Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated benefit obligation for pension plans | 2,800,000,000 |  |  |  | 2,600,000,000 |  |  |  | 2,800,000,000 | 2,600,000,000 |
International Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets | 1,835,000,000 |  |  |  | 1,558,000,000 |  |  |  | 1,835,000,000 | 1,558,000,000 |
International Pension Benefits | Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets | $ 84,000,000 |  |  |  | $ 72,000,000 |  |  |  | 84,000,000 | 72,000,000 |
International Pension Benefits | Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, curtailment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Defined benefit plan net actuarial loss |  |  |  |  |  |  |  |  | $ (123,000,000) | $ (213,000,000) |
Discount rate | 1.94% |  |  |  | 2.21% |  |  |  | 1.94% | 2.21% |
Projected benefit obligation, Projected Benefit Obligation Exceeds the Fair Value of the Plan Assets | $ 845,000,000 |  |  |  | $ 1,319,000,000 |  |  |  | $ 845,000,000 | $ 1,319,000,000 |
Pension obligations | 388,000,000 |  |  |  | 377,000,000 |  |  |  | 388,000,000 | 377,000,000 |
Fair value of plan assets | $ 1,835,000,000 |  |  |  | $ 1,558,000,000 |  |  |  | $ 1,835,000,000 | 1,558,000,000 | 1,284,000,000
Change in Assumptions for Defined Benefit Plans [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Change in unrecognized pension and postretirement benefit costs, net of tax |  |  |  |  |  |  |  |  |  | 810,000,000 |
Net Income |  |  |  |  |  |  |  |  |  | $ 616,000,000 |
Earnings Per Share, Basic and Diluted | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.71 |
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% |  |  |  |  |  |  |  | 95.00% |  |
Employee Defined Contribution Plans [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contributions charged to expense |  |  |  |  |  |  |  |  | $ 139,000,000 | $ 130,000,000 | 127,000,000
Pension and postretirement benefit expense |  |  |  |  |  |  |  |  | 84,000,000 | 67,000,000 | 28,000,000
Pension and postretirement benefit expense |  |  |  |  |  |  |  |  | 84,000,000 | 67,000,000 | 28,000,000
Amended Employee Defined Contribution Plans |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Increase (Decrease), Cost |  |  |  |  |  |  |  |  | 0 | 0 | 0
Defined Contribution Plan, Increase (Decrease), Cost |  |  |  |  |  |  |  |  | 0 | 0 | 0
Defined Contribution Money Purchase Plans [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contributions charged to expense |  |  |  |  |  |  |  |  | 107,000,000 | 97,000,000 | $ 92,000,000
Central States, South East & South West Areas Health and Welfare Fund | Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan net actuarial loss |  |  |  |  |  |  |  |  | (2,300,000,000) | $ (603,000,000) |
Multiemployer Plans, Withdrawal Obligation |  |  |  |  |  |  |  |  | 6,100,000,000 |  |
Increase in benefit obligation |  |  |  |  |  |  |  |  | 2,300,000,000 |  |
Pension obligations | $ 5,500,000,000 |  |  |  |  |  |  |  | $ 5,500,000,000 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Duration for unfunded commitments to be contributed | 3 years |  |  |  |  |  |  |  | 3 years |  |
Minimum | Private Equity and Real Estate | Other Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption notice period, lower limit |  |  |  |  |  |  |  |  | 10 years |  |
Minimum | U.S. Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Postretirement medical plans service minimum eligibility year |  |  |  |  |  |  |  |  | 10 years |  |
Postretirement medical plans service minimum eligibility age |  |  |  |  |  |  |  |  | 55 years |  |
Minimum | International Pension Benefits | 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% |  |  |  | 1.00% |  |  |  | 1.00% | 1.00% |
Minimum | Employee Defined Contribution Plans [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  |  |  |  |  |  | 3.00% |  |
Minimum | Amended Employee Defined Contribution Plans |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  |  |  |  |  |  | 5.00% |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Duration for unfunded commitments to be contributed | 6 years |  |  |  |  |  |  |  | 6 years |  |
Maximum | Private Equity and Real Estate | Other Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption notice period, upper limit |  |  |  |  |  |  |  |  | 15 years |  |
Maximum | International Pension Benefits | 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% |  |  |  | 10.00% | 10.00% |
Maximum | Employee Defined Contribution Plans [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  |  |  |  |  |  | 8.00% |  |
Maximum | Amended Employee Defined Contribution Plans |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined contribution plan, employer contribution (percentage) |  |  |  |  |  |  |  |  | 8.00% |  |
Defined Benefit Plan, Actuarial Assumptions Discount Rate |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan net actuarial loss |  |  |  |  |  |  |  |  | $ (7,300,000,000) | $ (7,500,000,000) |
Defined Benefit Plan, Actuarial Assumptions Demographic and Assumption Changes [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan net actuarial loss |  |  |  |  |  |  |  |  | $ (513,000,000) | $ 40,000,000 |

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