Stock-Based Compensation (Schedule Of Changes In Shares Subject To Options) (Details) - Stock Options [Member] $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price per share, Beginning of year | $ / shares	$ 56.37
Average exercise price per share, Options Granted | $ / shares	0
Average exercise price per share, Options Exercised | $ / shares	49.35
Average exercise price per share, Options canceled | $ / shares	57.85
Average exercise price per share, End of year | $ / shares	57.23
Average exercise price per share, Exercisable at year end | $ / shares	$ 57.27
Shares, Beginning of year | shares	7,801
Shares, Options granted | shares	0
Shares, Options exercised | shares	(854)
Shares, Options canceled | shares	(32)
Shares, End of year | shares	6,915
Shares, Exercisable at year end | shares	6,795
Total intrinsic value of awards, End of year | $	$ 67
Total intrinsic value of awards, Exercisable at year end | $	$ 66
Average remaining life, End of year	4 years 2 months 12 days
Average remaining life, Exercisable at year end	4 years 2 months 12 days