Fair Value Measurements (Reconciliation Of All Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Mar. 31, 2012 Significant Unobservable Inputs (Level 3) [Member]	Mar. 31, 2011 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2011 Fair Value, Measurements, Recurring [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Gains [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Gains [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Inventory Related Payables [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Inventory Related Payables [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Losses [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Losses [Member]	Mar. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market, Net [Member]	Mar. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market, Net [Member]	Mar. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts, Net [Member]	Mar. 31, 2011 Fair Value, Measurements, Recurring [Member] Derivative Contracts, Net [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Total Assets [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Total Assets [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Total Liabilities [Member]	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Total Liabilities [Member]
Threshold of relative value of unobservable inputs to the total fair value for Level 3	10.00%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period				$ 1,624	$ 762	$ 198	$ 112									$ 1,822	$ 874
Total increase (decrease) in unrealized gains included in cost of products sold				41	23	165	500									206	523
Purchases				1,286	2,381		4									1,286	2,385
Sales				(285)	(1,509)											(285)	(1,509)
Settlements						(100)	(344)									(100)	(344)
Transfers into Level 3				72	1,145	19	103									91	1,248
Transfers out of Level 3				(1,013)	(1,077)	(50)	(143)									(1,063)	(1,220)
Balance at end of period				1,725	1,725	232	232									1,957	1,957
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period								196	45	192	44							388	89
Total increase (decrease) in unrealized losses included in cost of products sold									4	159	465							159	469
Purchases								(1)	(3)		1							(1)	(2)
Sales								82	78									82	78
Settlements										(141)	(280)							(141)	(280)
Transfers into Level 3									153	12	31							12	184
Transfers out of Level 3								(140)	(140)	(38)	(77)							(178)	(217)
Balance at end of period								137	137	184	184							321	321
Fair Value, Assets and Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance at beginning of period		398	440									306	427	92	13
Total gains (losses), realized or unrealized, included in earnings before income taxes		240	342									236	240	4	102
Purchases, issuances and settlements		(50)	67									(46)	68	(4)	(1)
Transfers into Level 3		155	163									142	150	13	13
Transfers out of Level 3		(10)	(279)										(247)	(10)	(32)
Balance at end of period		733	733									638	638	95	95
Unrealized gains (losses) on derivative assets and liabilities		$ 79	$ 248