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	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Gains [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Gains [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventory Related Payables [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Inventory Related Payables [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Losses [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts Losses [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market, Net [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Inventories Carried At Market, Net [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Commodity Derivative Contracts, Net [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Derivative Contracts, Net [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total Assets [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Total Liabilities [Member]	Dec. 31, 2011 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				$ 1,348	$ 762	$ 270	$ 112									$ 1,618	$ 874
Total increase (decrease) in unrealized gains included in cost of products sold				28	(18)	138	335									166	317
Purchases				959	1,095		4									959	1,099
Sales				(963)	(1,224)											(963)	(1,224)
Settlements						(185)	(244)									(185)	(244)
Transfers into Level 3				306	1,073	34	84									340	1,157
Transfers out of Level 3				(54)	(64)	(59)	(93)									(113)	(157)
Balance at end of period				1,624	1,624	198	198									1,822	1,822
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period								134	45	244	44							378	89
Total increase (decrease) in unrealized losses included in cost of products sold								4	4	136	306							140	310
Purchases								4	(2)		1							4	(1)
Sales								(6)	(4)									(6)	(4)
Settlements										(158)	(139)							(158)	(139)
Transfers into Level 3								60	153	4	19							64	172
Transfers out of Level 3										(34)	(39)							(34)	(39)
Balance at end of period								196	196	192	192							388	388
Fair Value, Assets and Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance at beginning of period		406	440									371	427	35	13
Total gains (losses), realized or unrealized, included in earnings before income taxes		35	102									(27)	4	62	98
Purchases, issuances and settlements		44	117									43	114	1	3
Transfers into Level 3		1	8									2	8	(1)
Transfers out of Level 3		(88)	(269)									(83)	(247)	(5)	(22)
Balance at end of period		398	398									306	306	92	92
Unrealized gains (losses) on derivative assets and liabilities		$ 122	$ 169