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, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price per share, Beginning of year | $ / shares	$ 54.87
Average exercise price per share, Options Granted | $ / shares	53.71
Average exercise price per share, Options Exercised | $ / shares	51.09
Average exercise price per share, Options canceled | $ / shares	61.48
Average exercise price per share, End of year | $ / shares	55.49
Average exercise price per share, Exercisable at year end | $ / shares	$ 56.73
Shares, Beginning of year | shares	15,276
Shares, Options granted | shares	386
Shares, Options exercised | shares	(3,812)
Shares, Options canceled | shares	(1,091)
Shares, End of year | shares	10,759
Shares, Exercisable at year end | shares	8,222
Total intrinsic value of awards, End of year | $	$ 87
Total intrinsic value of awards, Exercisable at year end | $	$ 58
Average remaining life, End of year	5 years 10 months
Average remaining life, Exercisable at year end	5 years 1 month