Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions |
Jul. 29, 2018 |
Jan. 28, 2018 |
|---|---|---|
| Fair Value, Inputs, Level 1 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Derivative agreements - assets | $ 0 | $ 0 |
| Derivative agreements - liabilities | 0 | 0 |
| Derivative agreements - net fair value | 0 | 0 |
| Fair Value, Inputs, Level 2 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Derivative agreements - assets | 231 | 235 |
| Derivative agreements - liabilities | (20) | (12) |
| Derivative agreements - net fair value | 211 | 223 |
| Fair Value, Inputs, Level 3 [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Derivative agreements - assets | 0 | 0 |
| Derivative agreements - liabilities | 0 | 0 |
| Derivative agreements - net fair value | $ 0 | $ 0 |