Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
Jan. 31, 2016 |
Feb. 01, 2015 |
Jan. 31, 2016 |
Feb. 01, 2015 |
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Recognized net actuarial loss |
$ (7)
|
|
$ 121
|
|
| Pension Plan, Defined Benefit [Member] |
|
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Defined Benefit Plan, Service Cost |
7
|
$ 7
|
14
|
$ 14
|
| Defined Benefit Plan, Interest Cost |
25
|
26
|
50
|
53
|
| Expected return on plan assets |
(36)
|
(43)
|
(75)
|
(87)
|
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
0
|
0
|
0
|
0
|
| Recognized net actuarial loss |
(24)
|
0
|
112
|
0
|
| Defined Benefit Plan, Net Periodic Benefit Cost |
(28)
|
(10)
|
101
|
(20)
|
| Other Postretirement Benefit Plans, Defined Benefit [Member] |
|
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Defined Benefit Plan, Service Cost |
1
|
1
|
1
|
1
|
| Defined Benefit Plan, Interest Cost |
4
|
4
|
8
|
8
|
| Expected return on plan assets |
0
|
0
|
0
|
0
|
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
(1)
|
(1)
|
(1)
|
(1)
|
| Recognized net actuarial loss |
0
|
0
|
0
|
0
|
| Defined Benefit Plan, Net Periodic Benefit Cost |
$ 4
|
$ 4
|
$ 8
|
$ 8
|