Commitments And Contingent Liabilities Commitments and Contingent Liabilities (Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loss Contingencies [Line Items]
Litigation settlement payments				$ 438	$ 6
Litigation charges	44		118	60	118
Average Wholesale Price Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement payments	155			438	6
Litigation charges	44	16	118	60	118
Operating Expense [Member] | Distribution Solutions [Member] | Average Wholesale Price Litigation [Member]
Loss Contingencies [Line Items]
Litigation charges	$ 44		$ 118	$ 60	$ 118