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Income Taxes - Narratives (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]    
Provision (benefit) for federal income taxes $ 2,584 $ (50,571) [1],[2]
Effective Income Tax Rate Reconciliation, Percent 32.70% (623.30%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00%
[1] Represented the release of the valuation allowance for our deferred tax assets that generally is directly attributable to each segment based on the nature of the item.
[2] Certain prior period amounts have been reclassified to conform with the current period presentation.