Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
Assets:
Unrealized derivative gains	$ 3,372	$ 3,063
Deferred receivables consideration	894	629
Liabilities:
Unrealized derivative losses	2,902	2,995
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets:
Marketable securities	2,064	1,666
Total Assets	3,457	2,941
Liabilities:
Total Liabilities	1,769	1,489
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	1,393	1,275
Liabilities:
Unrealized derivative losses	1,769	1,487
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member]
Liabilities:
Unrealized derivative losses		2
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	5,653	5,297
Marketable securities	11	26
Deferred receivables consideration	894	629
Total Assets	8,478	7,569
Liabilities:
Inventory-related payables	539	307
Total Liabilities	1,702	1,634
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	1,697	1,397
Liabilities:
Unrealized derivative losses	917	1,038
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Unrealized derivative gains	222	219
Liabilities:
Unrealized derivative losses	243	289
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Contracts [Member]
Assets:
Unrealized derivative gains		1
Liabilities:
Unrealized derivative losses	3
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Unrealized derivative gains	1
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	1,755	1,462
Total Assets	2,037	1,633
Liabilities:
Inventory-related payables	40	38
Total Liabilities	257	217
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	282	171
Liabilities:
Unrealized derivative losses	216	179
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member]
Liabilities:
Unrealized derivative losses	1
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member]
Assets:
Inventories carried at market	7,408	6,759
Marketable securities	2,075	1,692
Deferred receivables consideration	894	629
Total Assets	13,972	12,143
Liabilities:
Inventory-related payables	579	345
Total Liabilities	3,728	3,340
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	3,372	2,843
Liabilities:
Unrealized derivative losses	2,902	2,704
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Foreign Exchange Contracts [Member]
Assets:
Unrealized derivative gains	222	219
Liabilities:
Unrealized derivative losses	244	291
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Other Contracts [Member]
Assets:
Unrealized derivative gains		1
Liabilities:
Unrealized derivative losses	3
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Interest Rate Contracts [Member]
Assets:
Unrealized derivative gains	$ 1