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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 18, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes Disclosure [Line Items] |  |  |  |  |
Increase in effective income tax rate |  | 3.00% |  |  |
Effective income tax rate |  | 24.00% | 21.00% | 20.00% |
Valuation allowance related to tax credit carryforwards |  | $ 4 | $ 4 |  |
Excess tax benefits |  | 9 | 11 | $ 11 |
Employment tax credit disallowed |  | 6 | 7 | 5 |
Unrecognized tax benefits |  | 8 | 7 | $ 6 | $ 6
State and Local Jurisdiction |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 39 | 53 |  |
State tax credit carryforwards |  | 6 | $ 6 |  |
Federal |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Net operating loss carryforwards |  | 2 |  |  |
Internal Revenue Service |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Employment tax credit disallowed |  | 11 |  |  |
Income tax examination, penalties and interest expense |  | 4 |  |  |
Recovery of disallowed tax credits | $ 15 |  |  |  |
2019 Equity Incentive Plan |  |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |  |
Excess tax benefits |  | $ 4 |  |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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