Stockholders' Equity (Details) - USD ($) $ in Millions		3 Months Ended
	May 01, 2019	Jul. 31, 2020	Jul. 31, 2019
Beginning balance	$ 1,647	$ 1,975	$ 1,647
Net income		324	186
Net other comprehensive income (loss)		24	(1)
Declaration of cash dividends		(167)	(158)
Acquisition of treasury stock			(1)
Stock-based compensation expense		3	3
Stock issued under compensation plans		10	16
Loss on issuance of treasury stock issued under compensation plans		(19)	(29)
Ending balance		2,150	1,663
Additional Paid-in Capital [Member]
Beginning balance	0	0	0
Stock-based compensation expense		3	3
Loss on issuance of treasury stock issued under compensation plans		(3)	(2)
Ending balance		0	1
Retained Earnings [Member]
Beginning balance	2,238	2,708	2,238
Adoption of ASU 2018-02	43
Net income		324	186
Declaration of cash dividends		(167)	(158)
Loss on issuance of treasury stock issued under compensation plans		(16)	(27)
Ending balance		2,849	2,282
AOCI Attributable to Parent [Member]
Beginning balance	(363)	(547)	(363)
Adoption of ASU 2018-02	(43)
Net other comprehensive income (loss)		24	(1)
Ending balance		(523)	(407)
Treasury Stock, Common [Member]
Beginning balance	(300)	(258)	(300)
Acquisition of treasury stock			(1)
Stock issued under compensation plans		10	16
Ending balance		(248)	(285)
Common stock, Class A, voting [Member] | Common Stock [Member]
Beginning balance	25	25	25
Ending balance		25	25
Common stock, Class B, nonvoting [Member] | Common Stock [Member]
Beginning balance	$ 47	47	47
Ending balance		$ 47	$ 47