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Marketable Securities - Contractual Maturity (Details) - USD ($)
$ in Millions
Oct. 27, 2019
Jan. 27, 2019
Amortized Cost    
Less than 1 year $ 9,657 $ 5,042
Due in 1 - 5 years 0 2,271
Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date 0 22
Amortized Cost 9,657 7,335
Estimated Fair Value    
Less than 1 year 9,657 5,034
Due in 1 - 5 years 0 2,268
Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date 0 22
Estimated Fair Value $ 9,657 $ 7,324