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INCOME TAXES INCOME TAXES - UNCERTAIN TAX POSITIONS (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 29 |  |  |
Income Tax Examination, Penalties and Interest Accrued | 6 | $ 7 |  | $ 6
Income Tax Examination, Penalties and Interest Expense | (1) | 1 | $ 1 |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 4 | 0 | 1 |
Beginning balance | 40 | 40 | 43 |
Additions related to prior years | 1 | 0 | 1 |
Releases related to prior years | (1) | (1) | (4) |
Additions related to current year activity | 0 | 2 | 2 |
Releases due to settlements | (4) | 0 | (1) |
Releases due to lapse of statute of limitations | (1) | (1) | (1) |
Ending balance | 35 | $ 40 | $ 40 |
State [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 5 |  |  |
Releases due to settlements | $ (5) |  |  |

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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