Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Capital Stock Issued [Member]	Capital Stock In Treasury [Member]	Additional Paid-In Capital [Member]	Earnings Retained In The Business [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interests [Member]
Capital stock, shares at Jul. 31, 2016		323
Treasury stock, shares at Jul. 31, 2016			(15)
Balance, value at Jul. 31, 2016	$ 1,533	$ 12	$ (664)	$ 354	$ 1,927	$ (104)	$ 8
Net earnings (loss)	569				569		0
Other comprehensive income (loss)	(13)					(14)	1
Dividends	$ (323)				(323)
Dividends per share	$ 1.05
Treasury stock purchased, shares			(5)
Treasury stock purchased, value	$ (305)		$ (305)
Treasury stock issued under management incentive and stock option plans, shares			1
Treasury stock issued under management incentive and stock option plans, value	29		$ 35	(6)
Capital stock, shares at Apr. 30, 2017		323
Treasury stock, shares at Apr. 30, 2017			(19)
Balance, value at Apr. 30, 2017	1,490	$ 12	$ (934)	348	2,173	(118)	9
Capital stock, shares at Jul. 30, 2017		323
Treasury stock, shares at Jul. 30, 2017			(22)
Balance, value at Jul. 30, 2017	1,645	$ 12	$ (1,066)	359	2,385	(53)	8
Noncontrolling interest acquired	47						47
Repurchase of noncontrolling interest	(47)						(47)
Net earnings (loss)	167				167		0
Other comprehensive income (loss)	(24)					(23)	(1)
Dividends	$ (316)				(316)
Dividends per share	$ 1.05
Treasury stock purchased, shares			(2)
Treasury stock purchased, value	$ (86)		$ (86)
Treasury stock issued under management incentive and stock option plans, shares			2
Treasury stock issued under management incentive and stock option plans, value	25		$ 48	(23)
Capital stock, shares at Apr. 29, 2018		323
Treasury stock, shares at Apr. 29, 2018			(22)
Balance, value at Apr. 29, 2018	$ 1,411	$ 12	$ (1,104)	$ 336	$ 2,236	$ (76)	$ 7