Fair Value Disclosures (Other Financial Instruments) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Apr. 29, 2017 |
Oct. 28, 2017 |
Jan. 28, 2017 |
Oct. 29, 2016 |
|
| Fair Value Disclosures [Abstract] | ||||
| Total debt, excluding unamortized debt issuance costs, capital leases, financing obligation and note payable, Fair Value | $ 3,683 | $ 4,495 | $ 4,759 | |
| Total debt, excluding unamortized debt issuance costs, capital leases, financing obligation and note payable, carrying amount | 4,324 | 4,665 | 4,837 | |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Carrying value of long-lived assets impaired, fair value disclosure | 86 | |||
| Asset Impairment Charges | $ 77 | 77 | ||
| Fair Value, Inputs, Level 2 [Member] | ||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Derivative Liability | 7 | $ 12 | $ 31 | |
| Assets, Fair Value Disclosure, Nonrecurring | $ 9 |