Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013 U.S. Salaried Defined Benefit Life Insurance Plan [Member]	Mar. 31, 2012 U.S. Salaried Defined Benefit Pension Plan [Member]	Jun. 30, 2012 Canadian Salaried Defined Benefit Pension Plan [Member]	Jun. 30, 2012 Canadian Salaried Healthcare Plan [Member]	Mar. 31, 2012 GME [Member]	Sep. 30, 2012 Pension Plan Split [Member] U.S. Salaried Defined Benefit Pension Plan [Member]	Sep. 30, 2012 Prior To Pension Plan Amendment [Member] U.S. Salaried Defined Benefit Pension Plan [Member]	Sep. 30, 2012 After Pension Plan Amendment [Member] U.S. Salaried Defined Benefit Pension Plan [Member]	Sep. 30, 2012 Partial Pension Plan Settlement [Member] U.S. Salaried Defined Benefit Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Benefit Obligation, Period Increase (Decrease)	$ (319)		$ 84	$ (28)
Accumulated Other Comprehensive Loss	236
Pre-tax gain	83
Curtailments		309
Plan Amendments						654
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate							4.21%	3.37%
Recognized Net Loss Due to Settlements									54
Interim Remeasurement					$ 150