Commitments And Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					9 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Charges incurred	$ 0			$ 27		$ 60	$ 145
Payments Made						(470)	(26)
Distribution Solutions [Member] | Average Wholesale Price Litigation [Member]
Loss Contingencies [Line Items]
AWP Litigation Reserve, Beginning Balance			453			453	330
Payments Made						(470)	(26)
AWP Litigation Reserve, Ending Balance	43			449		43	449
Operating Expense [Member] | Distribution Solutions [Member] | Average Wholesale Price Litigation [Member]
Loss Contingencies [Line Items]
Charges incurred	$ 0	$ 44	$ 16	$ 27	$ 118	$ 60	$ 145