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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Arrangement, Expensed and Capitalized, Amount
Stock-based compensation expense is reported as SG&A in the consolidated statements of operations as follows:
Year Ended December 31,
202320222021
Total stock-based compensation expense$77 $65 $51 
Income tax benefit(18)(15)(12)
Stock based-compensation expense, net of tax$59 $50 $39 
Schedule of Share-Based Payment Arrangement, Option and Stock Appreciation Rights, Activity
Stock options outstanding at December 31, 2023 are all held by current or former employees. The following table summarizes our stock option activity:
Year Ended December 31, 2023
Stock Options
(in thousands)
Weighted
Average Exercise Price
Weighted Average Remaining Contractual Term (Years)Aggregate Intrinsic Value (in millions)
Total outstanding at beginning of period10,918 $20.10 5.1$39.2 
Exercised(4,702)$20.20 
Forfeited or expired(90)$21.68 
Total outstanding at end of period6,126 $20.01 4.2$113.5 
Exercisable at December 31, 20236,126 $20.01 4.2$113.5 
Schedule of Share-Based Payment Arrangement, Restricted Stock Unit, Activity
The following table summarizes our restricted stock unit activity:
Year Ended December 31, 2023
Restricted Stock Units
(in thousands)
Weighted
Average Grant Date Fair Value
Total nonvested at beginning of period3,615 $21.49 
Granted2,119 $22.68 
Vested(1,610)$22.08 
Forfeited(216)$21.28 
Total nonvested at end of period3,908 $21.90