INCOME TAXES Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Operating Loss Carryforwards [Line Items] | ||
| Deferred Tax Assets, Operating Loss Carryforwards | $ 645 | $ 646 |
| Deferred Tax Assets, Tax Credit Carryforwards | 131 | 32 |
| Total Operating Loss and Tax Credit Carryforwards | 776 | 678 |
| Expiring within Five Years [Member] | ||
| Operating Loss Carryforwards [Line Items] | ||
| Deferred Tax Assets, Operating Loss Carryforwards | 43 | 22 |
| Deferred Tax Assets, Tax Credit Carryforwards | 8 | 3 |
| Expiring after Five Years or Indefinite Expiration [Member] | ||
| Operating Loss Carryforwards [Line Items] | ||
| Deferred Tax Assets, Operating Loss Carryforwards | 602 | 624 |
| Deferred Tax Assets, Tax Credit Carryforwards | $ 123 | $ 29 |