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Note 3 - Stock-based Compensation - Additional Information Regarding Stock Option Exercises (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Intrinsic value of stock options exercised $ 10 $ 7 $ 17 $ 51
Cash received from option exercises 9 7 17 24
Treasury shares repurchased for employee payroll taxes (1) (2) (3) (7)
Income tax benefit realized from option exercises 2 1 4 7
Aggregate grant-date fair value of stock options vested $ 0 $ 0 $ 14 $ 13