ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - CHANGES IN AOCI AND RECLASSIFICATION OUT OF AOCI (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2017
Accumulated Other Comprehensive Income/(Loss)		$ (13,891)		$ (13,891)		$ (14,632)
OCI before Reclassifications				553
Other Comprehensive Income (Loss), Net of Tax		280	$ 567	741	$ (48)
Hedges
Accumulated Other Comprehensive Income/(Loss)		(4,135)		(4,135)		(2,947)
OCI before Reclassifications	[1]			(1,188)
Other Comprehensive Income (Loss), Net of Tax				(1,188)
Investment Securities
Accumulated Other Comprehensive Income/(Loss)		(160)		(160)		(25)
OCI before Reclassifications	[1]			(129)
Other Comprehensive Income (Loss), Net of Tax				(135)
Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax				188
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]			(6)
Pension and Other Retiree Benefits
Accumulated Other Comprehensive Income/(Loss)		(4,286)		(4,286)		(4,397)
OCI before Reclassifications	[1]			(83)
Other Comprehensive Income (Loss), Net of Tax				111
Pension and Other Retiree Benefits | Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax	[2]			194
Financial Statement Translation
Accumulated Other Comprehensive Income/(Loss)		$ (5,310)		(5,310)		$ (7,263)
OCI before Reclassifications				1,953
Other Comprehensive Income (Loss), Net of Tax				1,953
Financial Statement Translation | Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax				$ 0

[1] Net of tax expense/(benefit) of $(578), $0 and $(12) 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 $69 for gains/losses on hedges, investment securities and pension and other retiree benefit items, respectively.