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Income Taxes - Narratives (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Capital loss carryforwards, valuation allowance $ 491    
Benefit for federal income taxes 50,571 [1] 0  
Deferred tax assets, net $ 49,700   $ (509)
[1] 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.