Non-designated Derivative Gains (Losses) (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	$ (137)	$ (234)	$ (154)
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(33)	(117)	(55)
Equity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(87)	(114)	(21)
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(15)	14	10
Credit Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	(2)	5	(1)
Other Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Changes in fair value of derivatives not designated as hedges	$ 0	$ (22)	$ (87)