Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 45
Total increase (decrease) in unrealized losses included in cost of products sold	1
Purchases	(8)
Balance at end of period	38
Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	44
Total increase (decrease) in unrealized losses included in cost of products sold	555
Settlements	(384)
Transfers into Level 3	72
Transfers out of Level 3	(108)
Balance at end of period	179
Total Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	89
Total increase (decrease) in unrealized losses included in cost of products sold	556
Purchases	(8)
Settlements	(384)
Transfers into Level 3	72
Transfers out of Level 3	(108)
Balance at end of period	$ 217