ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - CHANGES IN AOCI AND RECLASSIFICATION OUT OF AOCI (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Accumulated Other Comprehensive Income/(Loss)		$ (14,171)		$ (14,171)		$ (14,632)
OCI before Reclassifications				338
Other Comprehensive Income (Loss), Net of Tax		121	$ (579)	461	$ (615)
Hedges
Accumulated Other Comprehensive Income/(Loss)		(3,577)		(3,577)		(2,947)
OCI before Reclassifications	[1]			(630)
Other Comprehensive Income (Loss), Net of Tax				(630)
Investment Securities
Accumulated Other Comprehensive Income/(Loss)		(90)		(90)		(25)
OCI before Reclassifications	[1]			(61)
Other Comprehensive Income (Loss), Net of Tax				(65)
Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax				123
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]			(4)
Pension and Other Retiree Benefits
Accumulated Other Comprehensive Income/(Loss)		(4,269)		(4,269)		(4,397)
OCI before Reclassifications	[1]			1
Other Comprehensive Income (Loss), Net of Tax				128
Pension and Other Retiree Benefits | Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax	[2]			127
Financial Statement Translation
Accumulated Other Comprehensive Income/(Loss)		$ (6,235)		(6,235)		$ (7,263)
OCI before Reclassifications				1,028
Other Comprehensive Income (Loss), Net of Tax				1,028
Financial Statement Translation | Amounts Reclassified from AOCI
Other Comprehensive Income (Loss), Net of Tax				$ 0

[1] Net of tax expense/(benefit) of $(378), $0 and $23 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 $49 for gains/losses on hedges, investment securities and pension and other retiree benefit items, respectively.