Accumulated Other Comprehensive Income / (Loss) Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014		Dec. 31, 2013
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			$ (7,662)
Other Comprehensive Income Before Reclassification			(3,670)	[1]
Reclassifications out of Accumulated Other Comprehensive Income			15
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1,506)	365	(3,655)		1,133
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(11,317)		(11,317)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			(3,876)
Other Comprehensive Income Before Reclassification			902	[1]
Reclassifications out of Accumulated Other Comprehensive Income			(129)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			773
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(3,103)		(3,103)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			(18)
Other Comprehensive Income Before Reclassification			0	[1]
Reclassifications out of Accumulated Other Comprehensive Income			(2)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			(2)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(20)		(20)
Pension Plan [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			(5,165)
Other Comprehensive Income Before Reclassification			355	[1]
Reclassifications out of Accumulated Other Comprehensive Income			146
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			501
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(4,664)		(4,664)
Foreign Currency Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			1,397
Other Comprehensive Income Before Reclassification			(4,927)	[1]
Reclassifications out of Accumulated Other Comprehensive Income			0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			(4,927)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(3,530)		(3,530)
Reclassification out of AOCI - Components [Domain]
Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of Accumulated Other Comprehensive Income	$ 3	$ (4)	$ 15		$ 54

[1] Net of tax (benefit)/expense of $470, $1 and $138 for hedges, investment securities, and pension and other retiree benefits plans, respectively.