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Income Taxes (Narrative) (Detail) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Non Variable Interest Entities [Line Items]    
Federal statutory rate 35.00% 35.00%
Net deferred tax asset $ 1,200,000,000  
Capital loss carryforward   165,000,000
NOL carryforward   1,300,000,000
Non Variable Interest Entities [Member]
    
Non Variable Interest Entities [Line Items]    
Valuation allowance 94,000,000 146,000,000
Valuation Allowance Deferred Tax Asset Change In Amount $ 52,000,000