Employee Benefit Plans (Retirement Plan Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Remeasurement charge	$ 34
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	71	71	58
Interest cost	130	120	119
Expected return on plan assets	(141)	(132)	(117)
Remeasurement charge	30
Amortization of actuarial loss	52	59	31
Other amortization	5	5	6
Net periodic defined benefit plan expense	147	123	97
Defined contribution plans	45	43	40
Total retirement plan expense	192	166	137
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	7	8	9
Interest cost	12	13	16
Remeasurement charge	4
Amortization of actuarial loss			5
Other amortization	(2)	(1)	(1)
Net periodic defined benefit plan expense	21	20	29
Total retirement plan expense	$ 21	$ 20	$ 29