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Income Taxes - Narratives (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Income Tax Contingency [Line Items]            
Capital loss carryforwards, valuation allowance   $ 491        
Benefit (Provision) for federal income taxes (1,985) 50,600 0 48,586 [1] 0  
Deferred tax assets, net $ 48,700     $ 48,700   $ (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.