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EMPLOYEE BENEFIT PLANS - PLAN ASSETS (Details) - Qualified Defined Benefit [Member] - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset allocations | 100.00% | 100.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Plan Assets | $ 1,846 | $ 1,737 | $ 1,917
Level 2 [Member] |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Plan Assets | $ 1,755 | $ 1,652 |
Equity funds [Member] | U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset allocations | 30.00% | 28.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Equities, Range Minimum | 22.00% |  |
Equities, Range Maximum | 33.00% |  |
Equity funds [Member] | U.S. | Level 2 [Member] |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Plan Assets | $ 545 | $ 491 |
Equity funds [Member] | Non-U.S. [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset allocations | 12.00% | 12.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Equities, Range Minimum | 9.00% |  |
Equities, Range Maximum | 16.00% |  |
Equity funds [Member] | Non-U.S. [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Plan Assets | $ 218 | $ 208 |
Credit bond index fund [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Plan Assets | $ 992 | $ 953 |
Fixed Income Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset allocations | 53.00% | 55.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Equities, Range Minimum | 48.00% |  |
Equities, Range Maximum | 67.00% |  |
Real Estate [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset allocations | 5.00% | 5.00% |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Equities, Range Minimum | 0.00% |  |
Equities, Range Maximum | 8.00% |  |
Real Estate [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |  |
Plan Assets | $ 91 | $ 85 |

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