Accumulated Other Comprehensive Income Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Mar. 31, 2013		Mar. 31, 2012
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance				$ (9,333)	[1]
Other Comprehensive Income Before Reclassification				1,014	[1],[2]
Reclassifications out of Accumulated Other Comprehensive Income	(9)			37	[1]
Other Comprehensive Income (Loss), Net of Tax	(588)		1,311	1,051	[1]	(3,009)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(8,282)	[1]		(8,282)	[1]
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				(3,673)	[1]
Other Comprehensive Income Before Reclassification				385	[1],[2]
Reclassifications out of Accumulated Other Comprehensive Income				(173)	[1]
Other Comprehensive Income (Loss), Net of Tax				212	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(3,461)	[1]		(3,461)	[1]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance				(3)	[1]
Other Comprehensive Income Before Reclassification				9	[1],[2]
Reclassifications out of Accumulated Other Comprehensive Income				0	[1]
Other Comprehensive Income (Loss), Net of Tax				9	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	6	[1]		6	[1]
Pension Plans, Defined Benefit [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance				(5,300)	[1]
Other Comprehensive Income Before Reclassification				16	[1],[2]
Reclassifications out of Accumulated Other Comprehensive Income				210	[1]
Other Comprehensive Income (Loss), Net of Tax				226	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(5,074)	[1]		(5,074)	[1]
Foreign Currency Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance				(357)	[1]
Other Comprehensive Income Before Reclassification				604	[1],[2]
Reclassifications out of Accumulated Other Comprehensive Income				0	[1]
Other Comprehensive Income (Loss), Net of Tax				604	[1]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 247	[1]		$ 247	[1]

[1] All amounts are net of tax

[2] Net of tax of $127, $2 and $8 for hedges, investment securities, and defined benefit retirement plans, respectively.