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Income Taxes - Narratives (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Income Tax Disclosure [Abstract]            
Capital loss carryforwards, valuation allowance $ 447     $ 447    
Benefit (Provision) for federal income taxes (1,355) 50,600 0 47,231 [1] 0  
Deferred tax assets, net $ 48,300     $ 48,300   $ (509)
[1] Primarily represents the release of the valuation allowance for our deferred tax assets that primarily are directly attributable to each segment based on the nature of the item.