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INCOME TAXES INCOME TAXES - UNCERTAIN TAX POSITIONS (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 34 |  |  |
Income Tax Examination, Penalties and Interest Accrued | 7 | $ 6 |  | $ 5
Income Tax Examination, Penalties and Interest Expense | 1 | 1 | $ 2 |
Beginning balance | 40 | 43 | 40 |
Additions related to prior years | 0 | 1 | 16 |
Releases related to prior years | (1) | (4) | (2) |
Additions related to current year activity | 2 | 2 | 2 |
Releases due to settlements | 0 | (1) | (11) |
Releases due to lapse of statute of limitations | (1) | (1) | (2) |
Ending balance | $ 40 | $ 40 | $ 43 |

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