Non-Designated Derivative Gains (Losses) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	$ 157	$ (488)	$ (45)	$ (910)
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	188	(442)	113	(647)
Equity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(19)	(4)	(15)	(18)
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(4)	3	4	21
Credit Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	1	2	(2)	(2)
Commodity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	$ (9)	$ (47)	$ (145)	$ (264)