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EMPLOYEE BENEFIT PLANS (Tables) - Qualified Defined Benefit [Member] | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Assumptions Used [Table Text Block] | Weighted average assumptions used to determine benefit obligations: The rates below vary by plan and related work group.
| 2017 |  | 2016
Discount rates | 3.69% to 3.78% |  | 4.29% to 4.50%
Rate of compensation increases | 2.11% to 3.00% |  | 2.12% to 2.59%
Weighted average assumptions used to determine net periodic benefit cost: The rates below vary by plan and related work group.
| 2017 |  | 2016 |  | 2015
Discount rates | 4.29% to 4.50% |  | 4.55% to 4.69% |  | 4.20%
Expected return on plan assets | 5.50% to 6.00% |  | 6.00% to 6.50% |  | 6.50%
Rate of compensation increases | 2.12% to 2.59% |  | 2.06% to 2.65% |  | 2.85% to 3.91%
Schedule of Allocation of Plan Assets [Table Text Block] | Plan asset by fund category (in millions):
| 2017 |  | 2016 |  | Fair Value Hierarchy
Fund type: |  |  |  |  |
U.S. equity market fund | $ | 515 |  |  | $ | 545 |  |  | 1
Non-U.S. equity fund | 226 |  |  | 218 |  |  | 1
Credit bond index fund | 1,232 |  |  | 989 |  |  | 1
Plan assets in common commingled trusts | $ | 1,973 |  |  | $ | 1,752 |  |  |
Real estate | 97 |  |  | 91 |  |  | (a)
Cash equivalents | 13 |  |  | 3 |  |  | 1
Total plan assets | $ | 2,083 |  |  | $ | 1,846 |  |  |
(a) | In accordance with Subtopic 820-10, certain investments that are measured at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.
The target and actual asset allocation of the funds in the qualified defined-benefit plans, by asset category, are as follows:
| Target |  | 2017 |  | 2016
Asset category: |  |  |  |  |
Domestic equity securities | 5% - 33% |  | 25 | % |  | 30 | %
Non-U.S. equity securities | 1% - 16% |  | 11 | % |  | 12 | %
Fixed income securities | 48% - 95% |  | 59 | % |  | 53 | %
Real estate | 2% - 8% |  | 4 | % |  | 5 | %
Cash equivalents | 0% |  | 1 | % |  | — | %
Plan assets |  |  | 100 | % |  | 100 | %
Schedule of Net Funded Status [Table Text Block] | The following table sets forth the status of the qualified defined-benefit pension plans (in millions):
| 2017 |  | 2016
Projected benefit obligation (PBO) |  |  |
Beginning of year | $ | 2,043 |  |  | $ | 1,898 |
Service cost | 39 |  |  | 37 |
Interest cost | 74 |  |  | 73 |
Actuarial loss | 300 |  |  | 104 |
Benefits paid | (69 | ) |  | (69 | )
End of year | $ | 2,387 |  |  | $ | 2,043 |
Plan assets at fair value |  |  |  |  |
Beginning of year | $ | 1,846 |  |  | $ | 1,737 |
Actual return on plan assets | 291 |  |  | 178 |
Employer contributions | 15 |  |  | — |
Benefits paid | (69 | ) |  | (69 | )
End of year | $ | 2,083 |  |  | $ | 1,846 |
Unfunded status | $ | (304 | ) |  | $ | (197 | )
Percent funded | 87 | % |  | 90 | %
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | The amounts recognized in the consolidated balance sheets (in millions):
| 2017 |  | 2016
Accrued benefit liability-long term | $ | 335 |  |  | $ | 225 |
Plan assets-long term (within Other noncurrent assets) | (31 | ) |  | (28 | )
Total liability recognized | $ | 304 |  |  | $ | 197 |
The amounts not yet reflected in net periodic benefit cost and included in AOCL (in millions):
| 2017 |  | 2016
Prior service credit | $ | (9 | ) |  | $ | (10 | )
Net loss | 597 |  |  | 509 |
Amount recognized in AOCL (pretax) | $ | 588 |  |  | $ | 499 |
Schedule of Net Benefit Costs [Table Text Block] | Net pension expense for the qualified defined-benefit plans included the following components (in millions):
| 2017 |  | 2016 |  | 2015
Service cost | $ | 39 |  |  | $ | 37 |  |  | $ | 41 |
Interest cost | 74 |  |  | 73 |  |  | 84 |
Expected return on assets | (106 | ) |  | (108 | ) |  | (122 | )
Amortization of prior service credit | (1 | ) |  | (1 | ) |  | (1 | )
Recognized actuarial loss | 26 |  |  | 25 |  |  | 26 |
Settlement expense (special item) | — |  |  | — |  |  | 14 |
Net pension expense | $ | 32 |  |  | $ | 26 |  |  | $ | 42 |
Schedule of Expected Benefit Payments [Table Text Block] | Future benefits expected to be paid over the next ten years under the qualified defined-benefit pension plans from the assets of those plans (in millions):
| Total
2018 | $ | 97 |
2019 | 101 |
2020 | 116 |
2021 | 116 |
2022 | 130 |
2023– 2027 | 723 |

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