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INCOME TAXES Income Tax Disclosure (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]      
Deferred tax assets $ 109 $ 99  
Tax benefit, change in valuation allowance 5 4 $ 2
Deferred tax assets. net operating loss and tax credit carryforwards 65 72  
Deferred tax assets. net operating loss and tax credit carryforwards, subject to expiration 35 44  
Deferred tax assets. net operating loss and tax credit carryforwards, not subject to expiration 30 28  
Income taxes paid 442 384 231
State and Local Jurisdiction      
Income Tax Contingency [Line Items]      
Tax benefit from reversal of an accrual for uncertain tax position 9 8 8
Tax benefit. change in valuation allowance   1 $ 1
Other Noncurrent Assets      
Income Tax Contingency [Line Items]      
Deferred tax assets 109 99  
Other Noncurrent Liabilities      
Income Tax Contingency [Line Items]      
Deferred tax liabilities $ 20 $ 22