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Marketable Securities - Contractual Maturity (Details) - USD ($)
$ in Millions
Apr. 28, 2019
Jan. 27, 2019
Amortized Cost    
Less than 1 year $ 5,773 $ 5,042
Due in 1 - 5 years 1,896 2,271
Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date 23 22
Amortized Cost 7,692 7,335
Estimated Fair Value    
Less than 1 year 5,770 5,034
Due in 1 - 5 years 1,898 2,268
Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date 23 22
Estimated Fair Value $ 7,691 $ 7,324