| **PENSION AND OTHER POSTRETIREMENT BENEFITS - Additional Information (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |         |         |        |        |
|----------------------------------------------------------------------------------------------------------|----------------|-----------------|---------|---------|--------|--------|
||
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Percentage match of the employee contribution - Low end of range (percent)                               |           |            | 2.00%   |    |   |   |   |   |
| Percentage match of the employee contribution - High end of range (percent)                              |           |            | 6.00%   |    |   |   |   |   |
| Matching contributions charged to expense                                                                |           |            | $ 83    | $ 80    |   |   |   |   |
| Fair value of plan assets                                                                                |           |            | 5,305   | 5,133   |   |   |   | $ 4,489 |
| Projected benefit obligation                                                                             |           |            | 6,007   | 6,405   |   |   |   | 6,782 |
| Accumulated benefit obligation for all defined benefit pension plans                                     |           |            | $ 5,800 |    |   |   |   |   |
| Per capita cost of healthcare assumed for next fiscal year, pre-age 65                                   |           |            | 6.88%   |    |   |   |   |   |
| Per capita cost of healthcare assumed for next fiscal year, post-age 65                                  |           |            | 6.88%   |    |   |   |   |   |
| Voluntary contributions by employer to pension plan                                                      |           |            | $ 302   | 587     |   |   |   |   |
| Private equity funds                                                                                     |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Defined benefit plans, future unfunded commitments on NAV equity funds investments                       |           |            | $ 246   | 157     |   |   |   |   |
| Hedge funds                                                                                              |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Redemption period permitted on NAV equity funds investments                                              |           |            | 90 days |    |   |   |   |   |
| Scenario, Forecast                                                                                       |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Per capita cost of healthcare assumed for next fiscal year, pre-age 65                                   |           |            |    |    | 7.35%  |   |   |   |
| Per capita cost of healthcare assumed for next fiscal year, post-age 65                                  |           |            |    |    | 6.85%  |   |   |   |
| Per capita cost of healthcare assumed for next fiscal year (percent)                                     |           |            |    |    | 4.75%  |   |   |   |
| Ultimate per capita cost of healthcare assumed (percent)                                                 |           |            |    |    |   | 4.75%  |   |   |
| Pension                                                                                                  |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Fair value of plan assets                                                                                |           |            | $ 5,098 | 4,921   |   |   |   | 4,273 |
| Projected benefit obligation                                                                             |           |            | $ 5,774 | $ 6,140 |   |   |   | $ 6,471 |
| Discount rate (percent)                                                                                  |           |            | 4.05%   | 3.76%   |   |   |   |   |
| Expected return on plan assets                                                                           |           |            | 7.66%   | 7.65%   |   |   |   |   |
| Voluntary contributions by employer to pension plan                                                      |           |            | $ 303   | $ 591   |   |   |   |   |
| Pension | Scenario, Forecast                                                                             |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Expected return on plan assets                                                                           |           | 7.66%           |    |    |   |   |   |   |
| U.S. SRP                                                                                                 |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Fair value of plan assets                                                                                |           |            | 4,600   |    |   |   |   |   |
| Projected benefit obligation                                                                             |           |            | $ 5,200 |    |   |   |   |   |
| Cash balance benefit percentage                                                                          |           |            |    |    |   |   | 1.00% |   |
| Percentage of total projected benefit obligation (percent)                                               |           |            | 90.00%  |    |   |   |   |   |
| Discount rate (percent)                                                                                  |           |            | 4.07%   |    |   |   |   |   |
| Expected return on plan assets                                                                           |           |            | 7.75%   |    |   |   |   |   |
| U.S. SRP | Scenario, Forecast                                                                            |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Expected return on plan assets                                                                           |           | 7.75%           |    |    |   |   |   |   |
| U.S. SRP | Pension                                                                                       |           |            |    |    |   |   |   |   |
| **Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]**           |           |            |    |    |   |   |   |   |
| Voluntary contributions by employer to pension plan                                                      | $ 300          |            | $ 300   | $ 400   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Pension Plan, Percentage of Total Projected Benefit Obligation
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Defined Benefit Plan, Cash Balance Percentage
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| - Definition
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year, Post-Age 65
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| - Definition
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year, Pre-Age 65
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| X                                                                                                                                                                                                                                                                                                                                                             |
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| - Definition
Percentage employer matches of the employee's percentage contribution matched. High end of range.
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| - Definition
Percentage employer matches of the employee's percentage contribution matched. Low end of range.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| - Definition
Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
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| - Definition
Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.
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| - Definition
Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.
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| - Definition
Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of contribution received by defined benefit plan from employer which increases plan assets.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.
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| - Definition
Ultimate trend rate for health care cost for defined benefit postretirement plan.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| - Definition
Amount of discretionary contributions made by an employer to a defined contribution plan.
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| - Definition
Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments.
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| - Definition
The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments).
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