Fair Value Measurements (Reconciliation Of Assets 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
Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 762
Total increase (decrease) in unrealized gains included in cost of products sold	88
Purchases	7,036
Sales	(6,504)
Transfers into Level 3	90
Transfers out of Level 3	(10)
Balance at end of period	1,462
Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	112
Total increase (decrease) in unrealized gains included in cost of products sold	592
Purchases	2
Settlements	(490)
Transfers into Level 3	108
Transfers out of Level 3	(153)
Balance at end of period	171
Total Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	874
Total increase (decrease) in unrealized gains included in cost of products sold	680
Purchases	7,038
Sales	(6,504)
Settlements	(490)
Transfers into Level 3	198
Transfers out of Level 3	(163)
Balance at end of period	$ 1,633