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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

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