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Gains (Losses) on Fair Value Hedges and Related Hedged Items (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Foreign Exchange Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives $ (248) $ (331) $ 389 $ (364)
Hedged items 257 340 (349) 390
Total amount of ineffectiveness 9 9 40 26
Equity Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives (19) 15 (36) (77)
Hedged items 19 (15) 36 77
Total amount of ineffectiveness 0 0 0 0
Amount of equity contracts excluded from effectiveness assessment $ (25) $ (12) $ (29) $ (8)