Accelerated Share Repurchase Activity and Related Information (Detail) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	1 Months Ended		3 Months Ended	7 Months Ended		12 Months Ended
	Feb. 28, 2015	Aug. 31, 2014	Dec. 27, 2014	Feb. 28, 2015		Dec. 27, 2014	Mar. 31, 2014
August 2014 ASR
Accelerated Share Repurchases [Line Items]
Purchase Period End Date				February 2015
Number of Shares	13,300	59,900	8,300	81,525	[1]
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						December 2014
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							March 2014
Number of Shares							172,548
Average Repurchase Price Per Share							$ 69.55
ASR Amount							$ 12,000,000,000

[1] 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.