ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - CHANGES IN AOCI AND RECLASSIFICATION OUT OF AOCI (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Accumulated Other Comprehensive Income/(Loss)		$ (14,292)		$ (14,632)
OCI before Reclassifications		278
Other Comprehensive Income (Loss), Net of Tax		340	$ (36)
Hedges
Accumulated Other Comprehensive Income/(Loss)		(3,410)		(2,947)
OCI before Reclassifications	[1]	(463)
Other Comprehensive Income (Loss), Net of Tax		(463)
Investment Securities
Accumulated Other Comprehensive Income/(Loss)		(29)		(25)
OCI before Reclassifications	[1]	(2)
Other Comprehensive Income (Loss), Net of Tax		(4)
Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax		62
Amounts Reclassified from AOCI | Hedges
Other Comprehensive Income (Loss), Net of Tax	[2]	0
Amounts Reclassified from AOCI | Investment Securities
Other Comprehensive Income (Loss), Net of Tax	[2]	(2)
Pension and Other Retiree Benefits
Accumulated Other Comprehensive Income/(Loss)		(4,430)		(4,397)
OCI before Reclassifications	[1]	(97)
Other Comprehensive Income (Loss), Net of Tax		(33)
Pension and Other Retiree Benefits | Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax	[2]	64
Financial Statement Translation
Accumulated Other Comprehensive Income/(Loss)		(6,423)		$ (7,263)
OCI before Reclassifications		840
Other Comprehensive Income (Loss), Net of Tax		840
Financial Statement Translation | Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax		$ 0

[1] Net of tax expense/(benefit) of $(278), $0 and $(26) for gains/losses on hedges, investment securities and pension and other retiree benefit items, respectively.

[2] Net of tax expense/(benefit) of $0, $0 and $24 for gains/losses on hedges, investment securities and pension and other retiree benefit items, respectively.