Accumulated Other Comprehensive Income / (Loss) Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (7,662)
Other Comprehensive Income Before Reclassification	(2,161)	[1]
Reclassifications out of Accumulated Other Comprehensive Income	12
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(2,149)		768
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(9,811)
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	471	[1]
Reclassifications out of Accumulated Other Comprehensive Income	(63)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	408
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(3,468)
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	(3)	[1]
Reclassifications out of Accumulated Other Comprehensive Income	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(3)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(21)
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	207	[1]
Reclassifications out of Accumulated Other Comprehensive Income	75
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	282
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(4,883)
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	(2,836)	[1]
Reclassifications out of Accumulated Other Comprehensive Income	0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(2,836)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(1,439)
Reclassification out of AOCI - Components [Domain]
Accumulated Other Comprehensive Income [Line Items]
Reclassifications out of Accumulated Other Comprehensive Income	$ 12		$ 59

[1] Net of tax (benefit) / expense of $250, $1 and $90 for hedges, investment securities, and pension and other retiree benefits plans, respectively.