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Other Commitments and Contingent Liabilities (Tables) (Average Wholesale Price Litigation [Member])
 12 Months Ended
Mar. 31, 2014
Average Wholesale Price Litigation [Member]
  
Loss Contingencies [Line Items]  
Litigation Reserve and Expense
 
Years Ended March 31,
(In millions)
2014
 
2013
 
2012
AWP litigation reserve at beginning of period
$
42


$
453


$
330

Charges incurred
68


72


149

Payments made
(105
)

(483
)

(26
)
AWP litigation reserve at end of period
$
5


$
42


$
453