Shareholders' Equity - Accelerated Share Repurchase Activity and Related Information (Detail) - USD ($) $ / shares in Units, shares in Thousands	2 Months Ended	3 Months Ended		4 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Sep. 24, 2016	Nov. 30, 2016	Aug. 31, 2016	Apr. 30, 2016
November 2016 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date	2017-02
Number of shares repurchased (in shares)	44,814
ASR amount	$ 6,000,000,000
August 2016 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date				2016-11
Number of shares repurchased (in shares)		4,400	22,500	26,850
Average repurchase price per share (in dollars per share)				$ 111.73
ASR amount				$ 3,000,000,000
May 2016 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date					2016-08
Number of shares repurchased (in shares)					60,452
Average repurchase price per share (in dollars per share)					$ 99.25
ASR amount					$ 6,000,000,000
November 2015 ASR
Accelerated Share Repurchases [Line Items]
Stock repurchase program completion date						2016-04
Number of shares repurchased (in shares)						29,122
Average repurchase price per share (in dollars per share)						$ 103.02
ASR amount						$ 3,000,000,000