Long-term Debt (Issuance And Repurchase Of Notes) (Narrative) (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
Jul. 30, 2016 |
Oct. 31, 2015 |
Oct. 29, 2016 |
Oct. 31, 2015 |
| Proceeds from Debt, Net of Issuance Costs |
|
|
$ 692
|
$ 988
|
| Debt Instrument, Repurchase Amount |
|
|
742
|
0
|
| Gains (Losses) on Extinguishment of Debt |
|
|
$ (36)
|
0
|
| Fixed Rate 6.75% Notes Due July 2036 [Member] |
|
|
|
|
| Debt Instrument, Face Amount |
$ 700
|
|
|
|
| Debt instrument, stated rate |
6.75%
|
|
|
|
| Proceeds from Debt, Net of Issuance Costs |
$ 692
|
|
|
|
| Debt Issuance Cost |
8
|
|
|
|
| Fixed Rate 6.875% Notes Due November 2035 [Member] |
|
|
|
|
| Debt Instrument, Face Amount |
|
$ 1,000
|
|
$ 1,000
|
| Debt instrument, stated rate |
|
6.875%
|
|
6.875%
|
| Proceeds from Debt, Net of Issuance Costs |
|
$ 988
|
|
|
| Debt Issuance Cost |
|
12
|
|
|
| Fixed Rate 6.90% Notes Due July 2017 [Member] |
|
|
|
|
| Extinguishment of Debt, Amount |
700
|
|
|
|
| Debt Instrument, Repurchase Amount |
742
|
|
|
|
| Gains (Losses) on Extinguishment of Debt |
(36)
|
|
|
|
| Extinguishment of Debt, Gain (Loss), Net of Tax |
(22)
|
|
|
|
| Derivative, Gain on Derivative |
$ 7
|
|
|
|
| Adjustments for New Accounting Pronouncement [Member] |
|
|
|
|
| Unamortized Debt Issuance Expense |
|
$ 49
|
|
$ 49
|