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Retirement Benefit Plans , Change in Benefit Obligation and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Apr. 28, 2017
Apr. 29, 2016
Funded status at end of year:          
Underfunded status of the plans       $ (1,300) $ (1,400)
Amounts recognized on the consolidated balance sheets consist of:          
Non-current liabilities       (1,641) (1,759)
Pension benefits          
Change in projected benefit obligation:          
Projected benefit obligation at beginning of year $ 1,535        
Projected benefit obligation at end of year 1,734 $ 1,535      
Change in plan assets:          
Fair value of plan assets at beginning of year 1,113        
Fair value of plan assets at end of year 1,235 1,113      
Funded status at end of year:          
Fair value of plan assets 1,113 1,113   1,235 1,113
Benefit obligations 1,535 1,535   1,734 1,535
Underfunded status of the plans       (499) (422)
Recognized liability       (499) (422)
Amounts recognized on the consolidated balance sheets consist of:          
Recognized liability       (499) (422)
Plans with accumulated benefit obligations in excess of plan assets          
Accumulated benefit obligation       4,188 3,922
Projected benefit obligation       4,677 4,333
Plan asset at fair value       3,454 2,981
Plans with projected benefit obligations in excess of plan assets          
Projected benefit obligation       4,903 4,362
Plan assets at fair value       3,646 3,009
U.S. Pension Benefits | Pension benefits          
Defined Benefit Plan Disclosure [Line items]          
Accumulated benefit obligation at end of year       2,879 2,757
Change in projected benefit obligation:          
Projected benefit obligation at beginning of year 3,048 2,956      
Service cost 117 120 $ 104    
Interest cost 109 122 105    
Employee contributions 0 0      
Plan curtailments and settlements 0 (28)      
Actuarial (gain) loss (22) (42)      
Benefits paid (80) (80)      
Special termination benefits 60 0      
Currency exchange rate changes and other 0 0      
Projected benefit obligation at end of year 3,232 3,048 2,956    
Change in plan assets:          
Fair value of plan assets at beginning of year 2,138 2,204      
Actual return on plan assets 238 (70)      
Employer contributions 183 112      
Employee contributions 0 0      
Plan settlements 0 (28)      
Benefits paid (80) (80)      
Currency exchange rate changes and other 0 0      
Fair value of plan assets at end of year 2,479 2,138 2,204    
Funded status at end of year:          
Fair value of plan assets 2,138 2,204 2,204 2,479 2,138
Benefit obligations 3,048 2,956 2,956 3,232 3,048
Underfunded status of the plans       (753) (910)
Recognized liability       (753) (910)
Amounts recognized on the consolidated balance sheets consist of:          
Non-current assets       0 0
Current liabilities       (13) (12)
Non-current liabilities       (740) (898)
Recognized liability       (753) (910)
Amounts recognized in accumulated other comprehensive loss:          
Prior service cost (benefit)       3 4
Net actuarial loss       1,212 1,361
Ending balance       1,215 1,365
Non-U.S. Pension Benefits | Pension benefits          
Defined Benefit Plan Disclosure [Line items]          
Accumulated benefit obligation at end of year       1,518 1,367
Change in projected benefit obligation:          
Projected benefit obligation at beginning of year 1,535 1,647      
Service cost 70 81 60    
Interest cost 26 31 33    
Employee contributions 15 16      
Plan curtailments and settlements 6 (133)      
Actuarial (gain) loss 182 (103)      
Benefits paid (43) (49)      
Special termination benefits 0 0      
Currency exchange rate changes and other (57) 45      
Projected benefit obligation at end of year 1,734 1,535 1,647    
Change in plan assets:          
Fair value of plan assets at beginning of year 1,113 1,189      
Actual return on plan assets 109 (44)      
Employer contributions 76 93      
Employee contributions 15 16      
Plan settlements (1) (118)      
Benefits paid (43) (49)      
Currency exchange rate changes and other (34) 26      
Fair value of plan assets at end of year 1,235 1,113 1,189    
Funded status at end of year:          
Fair value of plan assets 1,113 1,189 1,189 1,235 1,113
Benefit obligations $ 1,535 $ 1,647 $ 1,647 1,734 1,535
Recognized liability       (499) (422)
Amounts recognized on the consolidated balance sheets consist of:          
Non-current assets       5 20
Current liabilities       (7) (8)
Non-current liabilities       (497) (434)
Recognized liability       (499) (422)
Amounts recognized in accumulated other comprehensive loss:          
Prior service cost (benefit)       (6) (14)
Net actuarial loss       450 359
Ending balance       $ 444 $ 345