Accumulated Other Comprehensive Income Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			$ (7,499)
Other Comprehensive Income Before Reclassification			1,079	[1]
Reclassifications out of Accumulated Other Comprehensive Income	(4)		54
Other Comprehensive Income (Loss), Net of Tax	365	485	1,133		1,639
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(6,366)		(6,366)
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			(3,529)
Other Comprehensive Income Before Reclassification			(252)	[1]
Reclassifications out of Accumulated Other Comprehensive Income			(58)
Other Comprehensive Income (Loss), Net of Tax			(310)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(3,839)		(3,839)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			(27)
Other Comprehensive Income Before Reclassification			9	[1]
Reclassifications out of Accumulated Other Comprehensive Income			(10)
Other Comprehensive Income (Loss), Net of Tax			(1)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(28)		(28)
Pension Plans, Defined Benefit [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			(4,296)
Other Comprehensive Income Before Reclassification			(158)	[1]
Reclassifications out of Accumulated Other Comprehensive Income			122
Other Comprehensive Income (Loss), Net of Tax			(36)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(4,332)		(4,332)
Foreign Currency Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			353
Other Comprehensive Income Before Reclassification			1,480	[1]
Reclassifications out of Accumulated Other Comprehensive Income			0
Other Comprehensive Income (Loss), Net of Tax			1,480
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 1,833		$ 1,833

[1] Net of tax (benefit) / expense of $(187), $3 and $(43) for hedges, investment securities, and defined benefit retirement plans, respectively.