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Accelerated Share Repurchase Activity and Related Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands
 1 Months Ended 3 Months Ended 7 Months Ended 12 Months Ended
Jul. 31, 2015
May. 31, 2015
Feb. 28, 2015
Aug. 31, 2014
Jul. 31, 2015
Dec. 27, 2014
Feb. 28, 2015
Dec. 27, 2014
Mar. 31, 2014
May 2015 ASR                  
Accelerated Share Repurchases [Line Items]                  
Purchase Period End Date         2015-07        
Number of Shares 10,000 38,300     48,293 [1]        
Average Repurchase Price Per Share         $ 124.24        
ASR Amount         $ 6,000,000,000        
August 2014 ASR                  
Accelerated Share Repurchases [Line Items]                  
Purchase Period End Date             2015-02    
Number of Shares     13,300 59,900   8,300 81,525 [2]    
Average Repurchase Price Per Share             $ 110.40    
ASR Amount             $ 9,000,000,000    
January 2014 ASR                  
Accelerated Share Repurchases [Line Items]                  
Purchase Period End Date               2014-12  
Number of Shares               134,247  
Average Repurchase Price Per Share               $ 89.39  
ASR Amount               $ 12,000,000,000  
April 2013 ASR                  
Accelerated Share Repurchases [Line Items]                  
Purchase Period End Date                 2014-03
Number of Shares                 172,548
Average Repurchase Price Per Share                 $ 69.55
ASR Amount                 $ 12,000,000,000
[1] Includes 38.3 million shares delivered and retired at the beginning of the purchase period, which began in the third quarter of 2015 and 10.0 million shares delivered and retired at the end of the purchase period, which concluded in the fourth quarter of 2015.
[2] Includes 59.9 million shares delivered and retired at the beginning of the purchase period, which began in the fourth quarter of 2014, 8.3 million net shares delivered and retired in the first quarter of 2015 and 13.3 million shares delivered and retired at the end of the purchase period, which concluded in the second quarter of 2015.