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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 12, 2018 | Jan. 01, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Years of service used in determining benefits |  |  | 5 years |  |
Net actuarial losses |  |  | $ 618,000,000 | $ 585,000,000 |
401(k) Plan |  |  |  |  |
Employer matching contribution percentage |  | 100.00% |  |  |
Employer matching contribution, Percent of employees' pay |  | 4.00% |  |  |
Employer matching contribution, addition |  |  | 2.00% |  |
Employer contribution amount |  |  | $ 68,000,000 | $ 61,000,000 | $ 55,000,000
Qualified Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Discount rate |  |  | 4.33% | 3.67% | 4.19%
Employer contributions | $ 50,000,000 |  | $ 50,000,000 | $ 0 |
Expected contribution |  |  | $ 0 |  |
Non-Qualified Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Discount rate |  |  | 4.24% | 3.53% | 4.05%
Employer contributions |  |  | $ 8,000,000 | $ 8,000,000 |
Expected contribution |  |  | $ 9,000,000 |  |
Postretirement Benefit Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Discount rate |  |  | 3.98% | 3.20% |
Expected contribution |  |  | $ 1,000,000 |  |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |  |  |
Assumed annual rate of increase in the per capita cost of covered health care benefits |  |  | 6.50% | 7.00% |
Ultimate health care cost trend rate |  |  | 5.00% | 5.00% |

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- Definition The assumed health care cost trend rate for the next year used to measure the benefit obligation. This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition Incremental Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. Subject to limits set by the Internal Revenue Service. + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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