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Retirement Benefit Plans (Details) - Pension plans - USD ($)
$ in Millions
3 Months Ended
Jul. 28, 2017
Jul. 29, 2016
U.S. Pension Benefits    
Net Periodic Benefit Cost    
Service cost $ 29 $ 29
Interest cost 30 27
Expected return on plan assets (52) (47)
Amortization of net actuarial loss 20 23
Net periodic benefit cost 27 32
Non-U.S. Pension Benefits    
Net Periodic Benefit Cost    
Service cost 17 19
Interest cost 7 6
Expected return on plan assets (13) (12)
Amortization of net actuarial loss 4 4
Net periodic benefit cost $ 15 $ 17