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Reconciliation of Weighted Average Number of Common and Common Equivalent Shares Outstanding and Awards Excluded from Diluted Earnings Per Share Calculation (Details) - shares
shares in Millions
3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Shares (in millions):    
Weighted average number of common and common equivalent shares outstanding (basic) 1,512 1,592
Weighted average dilutive impact of Awards 9 11
Weighted average number of common and common equivalent shares outstanding (diluted) 1,521 1,603
Awards excluded from diluted earnings per share 16 16