Fair Value Measurements (Reconciliation Of Liabilities Measured At Fair Value On A Recurring Basis) (Details) (Significant Unobservable Inputs (Level 3) [Member], Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 38	$ 45
Purchases	2	(6)
Sales		2
Transfers into Level 3		93
Balance at end of period	40	134
Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	179	44
Total increase (decrease) in unrealized gains included in cost of products sold	86	170
Purchases		1
Settlements	(105)	19
Transfers into Level 3	73	15
Transfers out of Level 3	(16)	(5)
Balance at end of period	217	244
Total Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	217	89
Total increase (decrease) in unrealized gains included in cost of products sold	86	170
Purchases	2	(5)
Sales		2
Settlements	(105)	19
Transfers into Level 3	73	108
Transfers out of Level 3	(16)	(5)
Balance at end of period	$ 257	$ 378