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Marketable Securities - Contractual Maturity (Details) - USD ($)
$ in Millions
Jul. 28, 2019
Jan. 27, 2019
Amortized Cost    
Less than 1 year $ 8,255 $ 5,042
Due in 1 - 5 years 112 2,271
Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date 4 22
Amortized Cost 8,371 7,335
Estimated Fair Value    
Less than 1 year 8,255 5,034
Due in 1 - 5 years 113 2,268
Mortgage-backed securities issued by United States government-sponsored enterprises not due at a single maturity date 4 22
Estimated Fair Value $ 8,372 $ 7,324