Non-Designated Derivative Gains (Losses) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	$ (205)	$ (77)	$ (202)	$ (422)
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(134)	28	(75)	(205)
Equity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(30)	(24)	4	(14)
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	9	24	8	18
Credit Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	2	1	(3)	(4)
Commodity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	$ (52)	$ (106)	$ (136)	$ (217)