Marketable Securities (Details) - USD ($) $ in Millions | Apr. 30, 2017 | Jan. 29, 2017 |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | $ 4,271 | $ 5,484 |
Unrealized Gain | 3 | 3 |
Unrealized Loss | (16) | (19) |
Classified as: | | |
Cash equivalents | 41 | 436 |
Marketable securities | 4,217 | 5,032 |
Total cash equivalents and marketable securities | 4,258 | 5,468 |
Amortized Cost | | |
Less than one year | 1,353 | 2,209 |
Due in 1-5 years | 2,853 | 3,210 |
Mortgage-backed securities issued by government-sponsored enterprises not due to a single maturity date | 65 | 65 |
Total | 4,271 | 5,484 |
Estimated Fair Value | | |
Less than one year | 1,353 | 2,209 |
Due in 1-5 years | 2,840 | 3,194 |
Mortgage-backed securities issued by United States government-sponsored enterprises not due to a single maturity date | 65 | 65 |
Total | 4,258 | 5,468 |
Fair value, unrealized loss position | | |
Fair value, unrealized loss less than 12 months | 3,449 | |
Fair value, unrealized loss greater than 12 months | 71 | |
Fair value with unrealized loss, total | 3,520 | |
Unrealized Loss Position, Aggregate Losses | | |
Unrealized loss, less than 12 months, gross | (15) | |
Unrealized loss, 12 months or greater, gross | (1) | |
Gross unrealized loss, total | (16) | |
Corporate debt securities | | |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | 1,866 | 2,397 |
Unrealized Gain | 1 | 1 |
Unrealized Loss | (7) | (10) |
Classified as: | | |
Cash equivalents | 0 | 33 |
Marketable securities | 1,860 | 2,355 |
Total cash equivalents and marketable securities | 1,860 | 2,388 |
Fair value, unrealized loss position | | |
Fair value, unrealized loss less than 12 months | 1,390 | |
Fair value, unrealized loss greater than 12 months | 18 | |
Fair value with unrealized loss, total | 1,408 | |
Unrealized Loss Position, Aggregate Losses | | |
Unrealized loss, less than 12 months, gross | (7) | |
Unrealized loss, 12 months or greater, gross | 0 | |
Gross unrealized loss, total | (7) | |
Debt securities of United States government agencies | | |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | 1,067 | 1,193 |
Unrealized Gain | 0 | 0 |
Unrealized Loss | (5) | (5) |
Classified as: | | |
Cash equivalents | 0 | 27 |
Marketable securities | 1,062 | 1,161 |
Total cash equivalents and marketable securities | 1,062 | 1,188 |
Fair value, unrealized loss position | | |
Fair value, unrealized loss less than 12 months | 984 | |
Fair value, unrealized loss greater than 12 months | 17 | |
Fair value with unrealized loss, total | 1,001 | |
Unrealized Loss Position, Aggregate Losses | | |
Unrealized loss, less than 12 months, gross | (5) | |
Unrealized loss, 12 months or greater, gross | 0 | |
Gross unrealized loss, total | (5) | |
Debt securities issued by the United States Treasury | | |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | 683 | 852 |
Unrealized Gain | 0 | 0 |
Unrealized Loss | (2) | (2) |
Classified as: | | |
Cash equivalents | 0 | 55 |
Marketable securities | 681 | 795 |
Total cash equivalents and marketable securities | 681 | 850 |
Fair value, unrealized loss position | | |
Fair value, unrealized loss less than 12 months | 669 | |
Fair value, unrealized loss greater than 12 months | 0 | |
Fair value with unrealized loss, total | 669 | |
Unrealized Loss Position, Aggregate Losses | | |
Unrealized loss, less than 12 months, gross | (2) | |
Unrealized loss, 12 months or greater, gross | 0 | |
Gross unrealized loss, total | (2) | |
Asset-backed Securities | | |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | 381 | 490 |
Unrealized Gain | 0 | 0 |
Unrealized Loss | (1) | (1) |
Classified as: | | |
Cash equivalents | 0 | 0 |
Marketable securities | 380 | 489 |
Total cash equivalents and marketable securities | 380 | 489 |
Fair value, unrealized loss position | | |
Fair value, unrealized loss less than 12 months | 355 | |
Fair value, unrealized loss greater than 12 months | 0 | |
Fair value with unrealized loss, total | 355 | |
Unrealized Loss Position, Aggregate Losses | | |
Unrealized loss, less than 12 months, gross | (1) | |
Unrealized loss, 12 months or greater, gross | 0 | |
Gross unrealized loss, total | (1) | |
Mortgage backed securities issued by United States government-sponsored enterprises | | |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | 169 | 161 |
Unrealized Gain | 2 | 2 |
Unrealized Loss | (1) | (1) |
Classified as: | | |
Cash equivalents | 0 | 0 |
Marketable securities | 170 | 162 |
Total cash equivalents and marketable securities | 170 | 162 |
Fair value, unrealized loss position | | |
Fair value, unrealized loss less than 12 months | 51 | |
Fair value, unrealized loss greater than 12 months | 36 | |
Fair value with unrealized loss, total | 87 | |
Unrealized Loss Position, Aggregate Losses | | |
Unrealized loss, less than 12 months, gross | 0 | |
Unrealized loss, 12 months or greater, gross | (1) | |
Gross unrealized loss, total | (1) | |
Foreign government bonds | | |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | 64 | 70 |
Unrealized Gain | 0 | 0 |
Unrealized Loss | 0 | 0 |
Classified as: | | |
Cash equivalents | 0 | 0 |
Marketable securities | 64 | 70 |
Total cash equivalents and marketable securities | 64 | 70 |
Money market funds | | |
Summary of cash equivalents and marketable securities: | | |
Amortized Cost | 41 | 321 |
Unrealized Gain | 0 | 0 |
Unrealized Loss | 0 | 0 |
Classified as: | | |
Cash equivalents | 41 | 321 |
Marketable securities | 0 | 0 |
Total cash equivalents and marketable securities | $ 41 | $ 321 |