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Income Taxes (Tables)
3 Months Ended
Oct. 28, 2017
Income Tax Disclosure [Abstract]  
Income Tax Provision
The following table provides details of income taxes (in millions, except percentages):
 
Three Months Ended
 
October 28,
2017
 
October 29,
2016
Income before provision for income taxes
$
2,962

 
$
2,953

Provision for income taxes
$
568

 
$
631

Effective tax rate
19.2
%
 
21.4
%