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Restructuring and Other Charges - Activities Related to Restructuring Reserves (Detail) - USD ($)
$ in Millions
 12 Months Ended
Apr. 29, 2016
Apr. 24, 2015
Apr. 25, 2014
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period $ 0 $ 27 $ 0
Net charges 108 0 88
Cash payments (63) (27) (61)
Balance at end of period 45 0 27
March 2016 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 0 0 0
Net charges 80 0 0
Cash payments (35) 0 0
Balance at end of period 45 0 0
May 2015 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 0 0 0
Net charges 28 0 0
Cash payments (28) 0 0
Balance at end of period 0 0 0
March 2014 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 0 27 0
Net charges 0 0 39
Cash payments 0 (27) (12)
Balance at end of period 0 0 27
May 2013 Restructuring      
Restructuring Cost and Reserve [Line Items]      
Balance at beginning of period 0 0 0
Net charges 0 0 49
Cash payments 0 0 (49)
Balance at end of period $ 0 $ 0 $ 0