Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) - USD ($)
$ in Millions |
3 Months Ended |
9 Months Ended |
May. 01, 2016 |
May. 03, 2015 |
May. 01, 2016 |
May. 03, 2015 |
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Recognized net actuarial loss |
$ 54
|
$ 26
|
$ 175
|
$ 26
|
| Pension Plan, Defined Benefit [Member] |
|
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Defined Benefit Plan, Service Cost |
6
|
8
|
20
|
22
|
| Defined Benefit Plan, Interest Cost |
24
|
26
|
74
|
79
|
| Expected return on plan assets |
(36)
|
(43)
|
(111)
|
(130)
|
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
(1)
|
(1)
|
(1)
|
(1)
|
| Recognized net actuarial loss |
61
|
5
|
173
|
5
|
| Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |
0
|
1
|
0
|
1
|
| Defined Benefit Plan, Net Periodic Benefit Cost |
54
|
(4)
|
155
|
(24)
|
| Other Postretirement Benefit Plans, Defined Benefit [Member] |
|
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Defined Benefit Plan, Service Cost |
0
|
1
|
1
|
2
|
| Defined Benefit Plan, Interest Cost |
4
|
3
|
12
|
11
|
| Expected return on plan assets |
0
|
0
|
0
|
0
|
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
0
|
0
|
(1)
|
(1)
|
| Recognized net actuarial loss |
0
|
22
|
0
|
22
|
| Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |
0
|
6
|
0
|
6
|
| Defined Benefit Plan, Net Periodic Benefit Cost |
$ 4
|
$ 32
|
$ 12
|
$ 40
|