| **RETIREMENT BENEFITS - Statement of Operations Information (Details) - USD ($) $ in Millions**   | 12 Months Ended |
|---------------------------------------------------------------------------------------------------|-----------------|
||
| **Operating**                                                                                     |            |   |   |
| Service cost                                                                                      | $ 35            | $ 46 |   |
| **Non-operating**                                                                                 |            |   |   |
| Interest cost                                                                                     | 397             | 227 |   |
| Pension                                                                                           |            |   |   |
| **Operating**                                                                                     |            |   |   |
| Service cost                                                                                      | 33              | 44 | $ 66 |
| **Non-operating**                                                                                 |            |   |   |
| Interest cost                                                                                     | 386             | 220 | 188 |
| Expected return on plan assets                                                                    | (633)           | (624) | (621) |
| Amortization of net actuarial (gain) loss                                                         | (9)             | 9 | 30 |
| Amortization of prior service credit                                                              | (26)            | (27) | (28) |
| Effect of curtailments or settlements                                                             | 0               | 0 | 1 |
| Non-service cost periodic benefit income                                                          | (282)           | (422) | (430) |
| Net periodic benefit income                                                                       | (249)           | (378) | (364) |
| **Other changes in plan assets and benefit obligations recognized in other comprehensive income** |            |   |   |
| Net actuarial gain                                                                                | (90)            | 42 | (972) |
| Prior service cost                                                                                | 0               | 8 | 2 |
| Amortization of net actuarial gain (loss)                                                         | 9               | (9) | (30) |
| Amortization of prior service credit                                                              | 26              | 27 | 28 |
| Currency translation adjustment                                                                   | 0               | 1 | 1 |
| Recognized prior service credit                                                                   | 0               | 0 | 4 |
| Recognized net actuarial loss                                                                     | 0               | 0 | (4) |
| Total change recognized in other comprehensive income                                             | (55)            | 69 | (971) |
| Total impact from net periodic benefit income and changes in other comprehensive income           | (304)           | (309) | (1,335) |
| Other Benefits                                                                                    |            |   |   |
| **Operating**                                                                                     |            |   |   |
| Service cost                                                                                      | 2               | 2 | 2 |
| **Non-operating**                                                                                 |            |   |   |
| Interest cost                                                                                     | 11              | 7 | 5 |
| Expected return on plan assets                                                                    | (20)            | (20) | (20) |
| Amortization of net actuarial (gain) loss                                                         | (20)            | (7) | 0 |
| Amortization of prior service credit                                                              | 1               | 1 | 1 |
| Non-service cost periodic benefit income                                                          | (28)            | (19) | (14) |
| Net periodic benefit income                                                                       | (26)            | (17) | (12) |
| **Other changes in plan assets and benefit obligations recognized in other comprehensive income** |            |   |   |
| Net actuarial gain                                                                                | (18)            | (34) | (46) |
| Prior service cost                                                                                | 20              | 7 | 0 |
| Amortization of net actuarial gain (loss)                                                         | (1)             | (1) | (1) |
| Total change recognized in other comprehensive income                                             | 1               | (28) | (47) |
| Total impact from net periodic benefit income and changes in other comprehensive income           | $ (25)          | $ (45) | $ (59) |

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.
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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.
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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.
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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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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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Amount of expense (reversal of expense) for net periodic benefit cost components, excluding service cost component, of defined benefit plan. Amount includes, but is not limited to, interest cost, expected (return) loss on plan asset, amortization of prior service cost (credit), amortization of (gain) loss, amortization of transition (asset) obligation, settlement (gain) loss, curtailment (gain) loss and certain termination benefits.
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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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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service 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 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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| - Definition
Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.
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