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Stock-based Compensation (Tables)
 9 Months Ended
Apr. 28, 2019
Stock-based Compensation  
Summary of Stock-based Compensation Expense [Table Text Block]
Total pre-tax stock-based compensation expense and tax-related benefits recognized in Earnings from continuing operations were as follows:
 
Three Months Ended
 
Nine Months Ended
 
April 28,
2019
 
April 29,
2018
 
April 28,
2019
 
April 29,
2018
Total pre-tax stock-based compensation expense
$
13

 
$
16

 
$
43

 
$
46

Tax-related benefits
$
2

 
$
3

 
$
8

 
$
10
Employee Stock Option [Member]  
Stock-based Compensation  
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of April 28, 2019:
 
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life
 
Aggregate
Intrinsic
Value
 
(Options in
thousands)
 
 
 
(In years)
 
 
Outstanding at July 29, 2018
1,537

 
$
50.36

 
 
 
 
Granted
596

 
$
35.74

 
 
 
 
Exercised
—

 
$
—

 
 
 
 
Terminated
(74
)
 
$
49.05

 
 
 
 
Outstanding at April 28, 2019
2,059

 
$
46.17

 
7.5
 
$
2

Exercisable at April 28, 2019
1,035

 
$
50.88

 
6.1
 
$
—
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
The weighted-average assumptions and grant-date fair values for grants in 2019 and 2018 were as follows:
 
2019
 
2018
Risk-free interest rate
2.79%
 
2.06%
Expected dividend yield
3.84%
 
2.95%
Expected volatility
25.28%
 
19.60%
Expected term
6.1 years
 
6 years
Grant-date fair value
$6.27
 
$6.67
Time Lapse. EPS, and FCF Restricted Stock Units [Member]  
Stock-based Compensation  
Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units and FCF Restricted Stock Units Table Text Block]
The following table summarizes time-lapse restricted stock units, EPS performance restricted stock units and FCF performance restricted stock units as of April 28, 2019:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 29, 2018
1,652

 
$
47.01

Granted
1,331

 
$
36.50

Vested
(689
)
 
$
47.77

Forfeited
(254
)
 
$
40.99

Nonvested at April 28, 2019
2,040

 
$
40.64
TSR Performance Restricted Stock/Units [Member]  
Stock-based Compensation  
TSR Performance Restricted Stock Units [Table Text Block]
The following table summarizes TSR performance restricted stock units as of April 28, 2019:
 
Units
 
Weighted-
Average
Grant-Date
Fair Value
 
(Restricted stock
units in thousands)
 
 
Nonvested at July 29, 2018
1,664

 
$
46.66

Granted
388

 
$
31.29

Vested
—

 
$
—

Forfeited
(710
)
 
$
55.98

Nonvested at April 28, 2019
1,342

 
$
37.30
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
We estimated the fair value of TSR performance restricted stock units at the grant date using a Monte Carlo simulation. Weighted-average assumptions used in the Monte Carlo simulations were as follows:
 
2019
 
2018
Risk-free interest rate
2.80%
 
1.58%
Expected dividend yield
3.79%
 
2.95%
Expected volatility
24.50%
 
19.07%
Expected term
3 years
 
3 years