Fair Value Measurements (Reconciliation Of All Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2011
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 440
Total gains (losses), realized or unrealized, included in earnings before income taxes	250
Purchases, issuances and settlements	252
Transfers into Level 3	323
Transfers out of Level 3	(480)
Balance at end of period	785
Inventories Carried At Market, Net [Member]
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	427
Total gains (losses), realized or unrealized, included in earnings before income taxes	171
Purchases, issuances and settlements	254
Transfers into Level 3	300
Transfers out of Level 3	(435)
Balance at end of period	717
Derivative Contracts, Net [Member]
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	13
Total gains (losses), realized or unrealized, included in earnings before income taxes	79
Purchases, issuances and settlements	(2)
Transfers into Level 3	23
Transfers out of Level 3	(45)
Balance at end of period	68
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unrealized gains (losses) on derivative assets and liabilities	$ 109