Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jul. 31, 2017

Accounting Policies [Abstract]

Composition of shares used in the computation of basic and diluted net income per share

The following table presents the composition of shares used in the computation of basic and diluted net income per share for the periods indicated.

	Twelve Months Ended July 31,
(In millions, except per share amounts)	2017		2016		2015
Numerator:
Net income from continuing operations	$	971	$	806	$	413
Net income (loss) from discontinued operations	—		173		(48		)
Net income	$	971	$	979	$	365
Denominator:
Shares used in basic per share amounts:
Weighted average common shares outstanding	257		262		281
Shares used in diluted per share amounts:
Weighted average common shares outstanding	257		262		281
Dilutive common equivalent shares from stock options and restricted stock awards	4		3		5
Dilutive weighted average common shares outstanding	261		265		286
Basic and diluted net income per share:
Basic net income per share from continuing operations	$	3.78	$	3.08	$	1.47
Basic net income (loss) per share from discontinued operations	—		0.65		(0.17		)
Basic net income per share	$	3.78	$	3.73	$	1.30
Diluted net income per share from continuing operations	$	3.72	$	3.04	$	1.45
Diluted net income (loss) per share from discontinued operations	—		0.65		(0.17		)
Diluted net income per share	$	3.72	$	3.69	$	1.28
Weighted average stock options and restricted stock units excluded from     calculation due to anti-dilutive effect	3		2		2