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, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average exercise price per share, Beginning of year | $ / shares	$ 55.40
Average exercise price per share, Options Granted | $ / shares	49.68
Average exercise price per share, Options Exercised | $ / shares	40.14
Average exercise price per share, Options canceled | $ / shares	56.78
Average exercise price per share, End of year | $ / shares	54.87
Average exercise price per share, Exercisable at year end | $ / shares	$ 54.56
Shares, Beginning of year | shares	13,646
Shares, Options granted | shares	3,077
Shares, Options exercised | shares	(701)
Shares, Options canceled | shares	(746)
Shares, End of year | shares	15,276
Shares, Exercisable at year end | shares	10,105
Total intrinsic value of awards, End of year | $	$ 43
Total intrinsic value of awards, Exercisable at year end | $	$ 30
Average remaining life, End of year	5 years 9 months
Average remaining life, Exercisable at year end	4 years 5 months