Accelerated Share Repurchase Activity and Related Information (Detail) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
		Jul. 31, 2015	Mar. 26, 2016	Feb. 28, 2015	Dec. 31, 2014
November 2015 ASR
Accelerated Share Repurchases [Line Items]
Purchase Period End Date			2016-04
Number of Shares	[1]		20,382
Average Repurchase Price Per Share	[1]
ASR Amount			$ 3,000,000,000
May 2015 ASR
Accelerated Share Repurchases [Line Items]
Purchase Period End Date		2015-07
Number of Shares		48,293
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				81,525
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

[1] "Number of Shares" represents those shares delivered in the beginning of the purchase period and does not represent the final number of shares to be delivered under the ASR. The total number of shares ultimately delivered, and therefore the average repurchase price paid per share, will be determined at the end of the applicable purchase period based on the volume-weighted average price of the Company's common stock during that period. The November 2015 ASR purchase period will end in or before April 2016.