Commitments and Contingent Liabilities (Tables) (Average Wholesale Price Litigation [Member])

6 Months Ended

Sep. 30, 2013

Average Wholesale Price Litigation [Member]

Loss Contingencies [Line Items]

Litigation Reserve and Expense

	Six Months Ended September 30,
(In millions)	2013			2012
AWP litigation reserve at beginning of period	$	42		$	453
Charges incurred	50			60
Payments made	(20		)	(438		)
AWP litigation reserve at end of period	$	72		$	75