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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,802 $ 1,770
Payroll taxes, benefits and workers’ compensation costs 1,457 1,438
Gross profit 345 332
Salaries, wages and payroll taxes 140 125
Stock-based compensation 10 11
Commissions 12 11
Advertising 7 6
General and administrative expenses 57 48
Depreciation and amortization 11 10
Total operating expenses 237 211
Operating income 108 121
Other income (expense):    
Interest income 10 9
Interest expense (7) (6)
Income before income tax expense 111 124
Income tax expense 32 29
Net income $ 79 $ 95
Basic net income per share of common stock (in dollars per share) $ 2.11 $ 2.49
Diluted net income per share of common stock (in dollars per share) $ 2.08 $ 2.45