Stock-Based Compensation (Schedule Of Changes In Shares Subject To Option) (Details) - Stock Options [Member] $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price per share, Beginning of year | $ / shares	$ 55.49
Average exercise price per share, Options Granted | $ / shares	66.49
Average exercise price per share, Options Exercised | $ / shares	53.20
Average exercise price per share, Options canceled | $ / shares	54.95
Average exercise price per share, End of year | $ / shares	56.37
Average exercise price per share, Exercisable at year end | $ / shares	$ 57.30
Shares, Beginning of year | shares	10,759
Shares, Options granted | shares	21
Shares, Options exercised | shares	(2,869)
Shares, Options canceled | shares	(110)
Shares, End of year | shares	7,801
Shares, Exercisable at year end | shares	6,680
Total intrinsic value of awards, End of year | $	$ 160
Total intrinsic value of awards, Exercisable at year end | $	$ 131
Average remaining life, End of year	5 years 1 month
Average remaining life, Exercisable at year end	4 years 9 months