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	3 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized gains on derivative assets	$ 157
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized losses on derivative liabilities	171
Fair Value, Assets and Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance at beginning of period		440
Total gains (losses), realized or unrealized, included in earnings before income taxes		68
Purchases, issuances and settlements		72
Transfers into Level 3		7
Transfers out of Level 3		(181)
Balance at end of period		406
Unrealized gains (losses) on derivative assets and liabilities		47
Fair Value, Measurements, Recurring [Member] | Inventories Carried At Market [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	762
Total increase (decrease) in realized or unrealized gains included in cost of products sold	(46)
Purchases	136
Sales	(261)
Transfers into Level 3	767
Transfers out of Level 3	(10)
Balance at end of period	1,348
Fair Value, Measurements, Recurring [Member] | Commodity Derivative Contracts Gains [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	112
Total increase (decrease) in realized or unrealized gains included in cost of products sold	197
Purchases	4
Settlements	(59)
Transfers into Level 3	50
Transfers out of Level 3	(34)
Balance at end of period	270
Fair Value, Measurements, Recurring [Member] | Inventory Related Payables [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	45
Purchases	(6)
Sales	2
Transfers into Level 3	93
Balance at end of period	134
Fair Value, Measurements, Recurring [Member] | Commodity Derivative Contracts Losses [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	44
Total increase (decrease) in realized or unrealized losses included in cost of products sold	170
Purchases	1
Settlements	19
Transfers into Level 3	15
Transfers out of Level 3	(5)
Balance at end of period	244
Fair Value, Measurements, Recurring [Member] | Inventories Carried At Market, Net [Member]
Fair Value, Assets and Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance at beginning of period		427
Total gains (losses), realized or unrealized, included in earnings before income taxes		31
Purchases, issuances and settlements		71
Transfers into Level 3		6
Transfers out of Level 3		(164)
Balance at end of period		371
Fair Value, Measurements, Recurring [Member] | Derivative Contracts, Net [Member]
Fair Value, Assets and Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Balance at beginning of period		13
Total gains (losses), realized or unrealized, included in earnings before income taxes		37
Purchases, issuances and settlements		1
Transfers into Level 3		1
Transfers out of Level 3		(17)
Balance at end of period		35
Fair Value, Measurements, Recurring [Member] | Total Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	874
Total increase (decrease) in realized or unrealized gains included in cost of products sold	151
Purchases	140
Sales	(261)
Settlements	(59)
Transfers into Level 3	817
Transfers out of Level 3	(44)
Balance at end of period	1,618
Fair Value, Measurements, Recurring [Member] | Total Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	89
Total increase (decrease) in realized or unrealized losses included in cost of products sold	170
Purchases	(5)
Sales	2
Settlements	19
Transfers into Level 3	108
Transfers out of Level 3	(5)
Balance at end of period	$ 378
Significant Unobservable Inputs (Level 3) [Member]
Threshold of relative value of unobservable inputs to the total fair value for Level 3	10.00%