Quarterly report pursuant to Section 13 or 15(d)

Litigation - Additional Information (Detail)

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Litigation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 3 Months Ended
May 16, 2012
Dec. 31, 2011
Jun. 30, 2013
State
Commitments And Contingencies Disclosure [Abstract]      
Reserved cost and potential exposure related to litigation and regulatory matters $ 50 $ 45  
Legal and professional fees   $ 5  
Number of states for Attorneys General     44