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Stock-based Compensation (Tables)
 9 Months Ended
Apr. 26, 2020
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 EndedNine Months Ended
 April 26,
2020		April 28,
2019		April 26,
2020		April 28,
2019
Total pre-tax stock-based compensation expense$14  $12  $45  $40  
Tax-related benefits$3  $2  $9  $7  
Total pre-tax stock-based compensation expense and tax-related benefits recognized in Earnings (loss) from discontinued operations were as follows:
Three Months EndedNine Months Ended
 April 26,
2020		April 28,
2019		April 26,
2020		April 28,
2019
Total pre-tax stock-based compensation expense$—  $2  $2  $5  
Tax-related benefits$—  $1  $—  $2  
Share-based Payment Arrangement, Option [Member]  
Stock-based Compensation  
Schedule Of Stock Option Activity [Table Text Block]
The following table summarizes stock option activity as of April 26, 2020:
OptionsWeighted-
Average
Exercise
Price		Weighted-
Average
Remaining
Contractual
Life		Aggregate
Intrinsic
Value
(Options in
thousands)		 (In years) 
Outstanding at July 28, 20192,059  $46.17  
Granted—  $—  
Exercised(481) $47.33  
Terminated(155) $49.46  
Outstanding at April 26, 20201,423  $45.42  7.2$9  
Exercisable at April 26, 2020833  $50.23  6.4$2  
Schedule Of Share Based Payment Award Valuation Assumptions [Table Text Block]
The weighted-average assumptions and grant-date fair value for grants in 2019 were as follows:
 2019
Risk-free interest rate2.79%
Expected dividend yield3.84%
Expected volatility25.28%
Expected term6.1 years
Grant-date fair value$6.27
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 26, 2020:
UnitsWeighted-Average Grant-Date Fair Value
 (Restricted stock
units in thousands)		 
Nonvested at July 28, 20191,308  $37.33  
Granted619  $63.06  
Vested—  $—  
Forfeited(657) $41.13  
Nonvested at April 26, 20201,270  $47.90  
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 simulation were as follows:
 20202019
Risk-free interest rate1.48%2.80%
Expected dividend yield2.95%3.79%
Expected volatility27.01%24.50%
Expected term3 years3 years
Time Lapse, EPS Performance, FCF Performance And Strategic Performance Restricted Stock Units [Member]  
Stock-based Compensation  
Time-Lapse Restricted Stock Units, EPS Performance Restricted Stock Units and FCF Performance 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 26, 2020:
UnitsWeighted-Average Grant-Date Fair Value
 (Restricted stock
units in thousands)		 
Nonvested at July 28, 20191,960  $40.57  
Granted1,141  $46.77  
Vested(723) $43.23  
Forfeited(362) $41.55  
Nonvested at April 26, 20202,016  $42.95