Gains (Losses) on Fair Value Hedges and Related Hedged Items (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	$ 48	$ 381	$ (33)	$ 622
Hedged items	(41)	(382)	50	(624)
Total amount of ineffectiveness	7	(1)	17	(2)
Equity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	(59)	18	(92)	(63)
Hedged items	59	(18)	92	63
Total amount of ineffectiveness	0	0	0	0
Amount of equity contracts excluded from effectiveness assessment	$ (15)	$ (9)	$ 4	$ (13)