Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations (Summary Of Discontinued Operations) (Parenthetical) (Detail)

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Discontinued Operations (Summary Of Discontinued Operations) (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Loss on sale of Discontinued operation $ 6