Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Apr. 27, 2018	Apr. 28, 2017
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 193	$ 155
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	2,600,000,000	2,600,000,000
Common stock, issued (in shares)	1,354,218,154	1,369,424,818
Common stock, outstanding (in shares)	1,354,218,154	1,369,424,818