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Taxes (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 03, 2018 | Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016
Net tax deficiencies from share based payment accounting |  | $ 15 |  |
Federal income tax statutory rate | 21.00% | 33.70% | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Percent |  | 1.90% |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ (571) | $ 0 | $ 0
Net change in the valuation allowance |  | $ 29 | 9 |
Valuation Allowance, Deferred Tax Asset, Explanation of Change |  | 11 |  |
Federal net operating loss carryforwards | $ 0 | $ 0 |  |
Operating Loss Carryforwards | 138 | 138 |  |
State credit carryforwards | 16 | 16 |  |
Unrecognized tax benefits that would impact effective income tax rate | 111 | 111 | 109 |
Charges (credit) to income tax expense for federal, state and local interest and penalties |  | (3) | 2 | $ 1
Accrual for payment of federal, state and local interest and penalties | 51 | 51 | $ 55 |
Other noncurrent liabilities [Member] |  |  |  |
Accrual for payment of federal, state and local interest and penalties | 27 | 27 |  |
Current Income Taxes [Member] |  |  |  |
Accrual for payment of federal, state and local interest and penalties | $ 24 | $ 24 |  |
Maximum [Member] |  |  |  |
Operating Loss Carryforwards, Expiration Dates |  | Dec. 31, 2037 |  |
Minimum [Member] |  |  |  |
Operating Loss Carryforwards, Expiration Dates |  | Dec. 31, 2018 |  |

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