Fair Value Measurements And Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2011
Derivative [Line Items]
Maximum duration for commodity futures and swap contracts, months			18
Maximum duration for interest rate forward contracts, months			6
Maximum duration for foreign currency contracts, months			12
Derivative financial instruments designated as fair value hedges	0	0	0	0
Settlement of interest rate lock	$ 36
Notional value of commodity derivatives	34		34		44
Estimated fair value of long-term debt	2,612		2,612		2,303
Diesel Fuel Commodity Contract [Member]
Derivative [Line Items]
Notional value of commodity derivatives	0		0		3
Jet Fuel Commodity Contract [Member]
Derivative [Line Items]
Notional value of commodity derivatives	23		23		22
Soybean Oil Commodity Contract [Member]
Derivative [Line Items]
Notional value of commodity derivatives	8		8		16
Crude Oil Commodity Contract [Member]
Derivative [Line Items]
Notional value of commodity derivatives	3		3		3
Canada Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Notional value of foreign currency derivatives	19		19		28
Australia Foreign Currency Exchange Contracts [Member]
Derivative [Line Items]
Notional value of foreign currency derivatives	13		13		13
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional value of interest rate forward contracts	0		0		300
Maximum [Member]
Derivative [Line Items]
Estimated amount of the existing net loss to be reclassified into earnings, in the next 12 months			$ 1