| **PENSION AND OTHER POSTRETIREMENT BENEFITS - Income Statement Information (Details) - USD ($) $ in Millions** | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Net periodic benefit income(1)**                                                                             |            |   |   |
| Service cost                                                                                                   | $ 40            | $ 59 |   |
| Interest cost                                                                                                  | 202             | 192 |   |
| Discontinued operations, net of income taxes                                                                   |            |   |   |
| **Net periodic benefit income(1)**                                                                             |            |   |   |
| Total net periodic benefit income                                                                              |            | 2 | $ 4 |
| Pension                                                                                                        |            |   |   |
| **Net periodic benefit income(1)**                                                                             |            |   |   |
| Service cost                                                                                                   | 39              | 58 | 75 |
| Interest cost                                                                                                  | 195             | 184 | 245 |
| Expected return on plan assets                                                                                 | (369)           | (340) | (347) |
| Amortization of prior service credit                                                                           | 0               | 0 | 0 |
| Amortization of net actuarial loss (gain)                                                                      | 0               | 1 | 1 |
| Net periodic benefit income                                                                                    | (135)           | (97) | (26) |
| Effect of curtailments, settlements or special termination benefits                                            | 0               | 0 | 1 |
| Total net periodic benefit income                                                                              | (135)           | (97) | (25) |
| **Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income)**       |            |   |   |
| Net actuarial loss (gain)                                                                                      | (106)           | (284) | 645 |
| Prior service cost (credit)                                                                                    | 2               | 0 | 3 |
| Amortization of prior service credit                                                                           | 0               | 0 | 0 |
| Amortization of net actuarial loss                                                                             | 0               | (1) | (1) |
| Total change recognized in other comprehensive loss (income)                                                   | (104)           | (285) | 647 |
| Total impact from net periodic benefit cost and changes in other comprehensive loss (income)                   | (239)           | (382) | 622 |
| Other Benefits                                                                                                 |            |   |   |
| **Net periodic benefit income(1)**                                                                             |            |   |   |
| Service cost                                                                                                   | 1               | 1 | 1 |
| Interest cost                                                                                                  | 7               | 8 | 13 |
| Expected return on plan assets                                                                                 | (16)            | (17) | (18) |
| Amortization of prior service credit                                                                           | 0               | 0 | (5) |
| Amortization of net actuarial loss (gain)                                                                      | (1)             | 0 | 1 |
| Net periodic benefit income                                                                                    | (9)             | (8) | (8) |
| Effect of curtailments, settlements or special termination benefits                                            | 0               | 0 | (121) |
| Total net periodic benefit income                                                                              | (9)             | (8) | (129) |
| **Other changes in plan assets and benefit obligations recognized in other comprehensive loss (income)**       |            |   |   |
| Net actuarial loss (gain)                                                                                      | (20)            | (38) | 15 |
| Prior service cost (credit)                                                                                    | 0               | 0 | (121) |
| Amortization of prior service credit                                                                           | 1               | 0 | 126 |
| Amortization of net actuarial loss                                                                             | 0               | 0 | (2) |
| Total change recognized in other comprehensive loss (income)                                                   | (19)            | (38) | 18 |
| Total impact from net periodic benefit cost and changes in other comprehensive loss (income)                   | $ (28)          | $ (46) | $ (111) |

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Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Amortization Of Gain (Loss)
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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.
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| - Definition
Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.
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| - Definition
Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.
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| - Definition
Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| - Definition
Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.
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| - Definition
Amount of cost recognized for passage of time related to defined benefit plan.
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| - Definition
Amount of net periodic benefit cost (credit) for defined benefit plan.
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| - Definition
Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.
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| - Definition
Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.
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| - Definition
Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).
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| - Definition
Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
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| - Definition
Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.
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