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Fair Value Measurements (Fair Value, Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 29, 2017 | Jul. 30, 2016 | Apr. 30, 2016 | Jul. 29, 2017 | Jul. 30, 2016 | Jan. 28, 2017
Available-for-sale Securities, Gross Realized Gains |  |  |  | $ 0 | $ 4 |
Assets: |  |  |  |  |  |
Cash and Cash Equivalents | $ 1,360 | $ 1,273 |  | 1,360 | 1,273 | $ 1,934
Available-for-sale Securities | 6 | 8 |  | 6 | 8 | 5
Foreign Currency Cash Flow Hedge Asset at Fair Value | 8 | 16 |  | 8 | 16 | 18
Interest Rate Fair Value Hedges | 2 | 8 |  | 2 | 8 | 2
Proceeds from Sale of Available-for-sale Securities, Equity |  |  | $ 10 |  |  |
Liabilities: |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | 11 |  |  | 11 |  | 1
Marketable Securities, Realized Gain (Loss) | 0 | 0 | $ (3) | 0 | (3) |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and Cash Equivalents | 1,360 | 1,273 |  | 1,360 | 1,273 | 1,934
Available-for-sale Securities | 6 | 8 |  | 6 | 8 | 5
Foreign Currency Cash Flow Hedge Asset at Fair Value | 0 | 0 |  | 0 | 0 | 0
Interest Rate Fair Value Hedges | 0 | 0 |  | 0 | 0 | 0
Liabilities: |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | 0 |  |  | 0 |  | 0
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and Cash Equivalents | 0 | 0 |  | 0 | 0 | 0
Available-for-sale Securities | 0 | 0 |  | 0 | 0 | 0
Foreign Currency Cash Flow Hedge Asset at Fair Value | 8 | 16 |  | 8 | 16 | 18
Interest Rate Fair Value Hedges | 2 | 8 |  | 2 | 8 | 2
Liabilities: |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | 11 |  |  | 11 |  | 1
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Assets: |  |  |  |  |  |
Cash and Cash Equivalents | 0 | 0 |  | 0 | 0 | 0
Available-for-sale Securities | 0 | 0 |  | 0 | 0 | 0
Foreign Currency Cash Flow Hedge Asset at Fair Value | 0 | 0 |  | 0 | 0 | 0
Interest Rate Fair Value Hedges | 0 | $ 0 |  | 0 | $ 0 | 0
Liabilities: |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Liability at Fair Value | $ 0 |  |  | $ 0 |  | $ 0

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