Stock-Based Compensation - Schedule of Changes in Shares Subject to Options (Details) - Employee Stock Option $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
Weighted- Average Exercise Price Per Share
Beginning of year (in dollars per share) | $ / shares	$ 58.10
Exercised (in dollars per share) | $ / shares	60.66
Canceled/Forfeited (in dollars per share) | $ / shares	53.05
End of year (in dollars per share) | $ / shares	53.35
Exercisable at end of year(in dollars per share) | $ / shares	$ 53.35
Shares
Beginning of year (in shares) | shares	1,692
Options exercised (in shares) | shares	(1,099)
Options canceled (in shares) | shares	(4)
End of year (in shares) | shares	589
Exercisable at end of year (in shares) | shares	589
Total Intrinsic Value of Shares
Total intrinsic value of awards, at end of year | $	$ 26
Total intrinsic value of awards, exercisable at end of year | $	$ 26
Average Remaining Life (Years)
Average remaining life, at end of year	2 years 1 month 6 days
Average remaining life, exercisable at year end	2 years 1 month 6 days