Share Repurchases (Detail) - USD ($) shares in Millions, $ in Millions		3 Months Ended						9 Months Ended
		Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Mar. 31, 2017	Mar. 31, 2016
Share Repurchases [Line Items]
Shares of common stock repurchased								147	224
Value of common stock repurchased								$ 8,683	$ 11,200
Share Repurchase Program 2013
Share Repurchases [Line Items]
Shares of common stock repurchased	[1]		59	63	69	66	89
Value of common stock repurchased	[1]		$ 3,533	$ 3,550	$ 3,600	$ 3,600	$ 4,000
Share Repurchase Program 2016
Share Repurchases [Line Items]
Shares of common stock repurchased	[2]	25
Value of common stock repurchased	[2]	$ 1,600

[1] Repurchased under the share repurchase program approved September 16, 2013.

[2] Repurchased under the share repurchase program approved September 20, 2016.