Fair Value Measurements (Reconciliation Of Assets 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
Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 1,462	$ 762
Total increase (decrease) in unrealized gains included in cost of products sold	164	(46)
Purchases	2,390	136
Sales	(2,225)	(261)
Transfers into Level 3	157	767
Transfers out of Level 3	(193)	(10)
Balance at end of period	1,755	1,348
Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	171	112
Total increase (decrease) in unrealized gains included in cost of products sold	109	197
Purchases		4
Settlements	(95)	(59)
Transfers into Level 3	128	50
Transfers out of Level 3	(31)	(34)
Balance at end of period	282	270
Total Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	1,633	874
Total increase (decrease) in unrealized gains included in cost of products sold	273	151
Purchases	2,390	140
Sales	(2,225)	(261)
Settlements	(95)	(59)
Transfers into Level 3	285	817
Transfers out of Level 3	(224)	(44)
Balance at end of period	$ 2,037	$ 1,618