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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:        
Net operating losses (federal and state) $ 3 $ 3    
Accrued expenses 14 8    
Accrued workers' compensation costs 9 9    
Deferred Tax Assets, Recovery Credit 26 0    
Deferred Tax Assets, Operating Lease Liabilities 15 17    
Stock based compensation 3 3    
Tax benefits relating to uncertain positions 1 1    
Tax credits (federal and state) 8 7    
Total 79 48    
Valuation allowance (5) (5) $ (7) $ (7)
Total deferred tax assets 74 43    
Deferred tax liabilities:        
Depreciation and amortization (37) (27)    
Deferred service revenues (20) (41)    
Prepaid commission expenses (22) (19)    
Operating lease right-of-use assets (13) (15)    
Other (2) (1)    
Total deferred tax liabilities (94) (103)    
Net deferred tax liabilities $ (20) $ (60)