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Investments (Maturities of Fixed Income Securities) (Details)
$ in Millions
Apr. 28, 2018
USD ($)
Schedule of Investments [Line Items]  
Amortized Cost $ 47,013
Fair Value 46,387
Less than 1 year  
Schedule of Investments [Line Items]  
Amortized Cost 13,959
Fair Value 13,908
Due in 1 to 2 years  
Schedule of Investments [Line Items]  
Amortized Cost 10,521
Fair Value 10,414
Due in 2 to 5 years  
Schedule of Investments [Line Items]  
Amortized Cost 18,552
Fair Value 18,230
Due after 5 years  
Schedule of Investments [Line Items]  
Amortized Cost 1,972
Fair Value 1,900
Mortgage-backed securities with no single maturity  
Schedule of Investments [Line Items]  
Amortized Cost 2,009
Fair Value $ 1,935