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INCOME TAXES - NET OPERATING LOSSES AND TAX CREDIT CARRYFORWARDS (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Valuation allowances | $ 164 | $ 133
U.S. Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
NOLs | 2,688 |
U.S. Federal [Member] | General business tax credits [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credits | 417 |
U.S. Federal [Member] | Foreign tax credits [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credits | 624 |
Valuation allowances | 109 | 83
U.S. state [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
NOLs | 1,942 |
U.S. state [Member] | General business tax credits [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credits | 82 |
U.S. state [Member] | Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation allowances | 35 | 30
Non-U.S. [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
NOLs | 264 |
Non-U.S. [Member] | Deferred Tax Assets, Operating Loss Carryforwards [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Valuation allowances | $ 20 | $ 20

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