Inventories, Derivative Instruments & Hedging Activities (Details) (USD $) In Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2010
LIFO inventories
FIFO value	$ 646	$ 1,143	$ 646
LIFO valuation reserve	(225)	(593)	(225)
LIFO inventories carrying value	421	550	421
FIFO inventories	3,218	5,590	3,218
Market inventories	4,232	5,915	4,232
Total Inventories	7,871	12,055	7,871
Derivatives, fair value
Pre-tax gains (losses) recognized in earnings from interest rate swaps that have been de-designated	(59)	30	(59)
Derivative Instruments and Hedging Activities
After-tax gains deferred in AOCI on discontinuation of hedge accounting treatment on interest rate swaps		21		21
Amortization period for gains on de-designated hedges in AOCI (in years)		30Y
Not designated as hedging instrument
Derivatives, fair value
FX Contracts Assets	200	237	200
Interest Contracts Assets		3
Commodity Contracts Assets	2,727	2,766	2,727
Total fair value of derivative assets not designated as hedging instruments	2,927	3,006	2,927
FX Contracts Liabilities	266	178	266
Interest Contracts Liabilities	26		26
Commodity Contracts Liabilities	3,152	2,553	3,152
Total fair value of derivative liabilities not designated as hedging instruments.	$ 3,444	$ 2,731	$ 3,444