Income Taxes - Narratives (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Provision (benefit) for federal income taxes	$ 1,752	$ 1,985	[1]	$ 4,336	$ (48,586)	[1],[2]
Effective Income Tax Rate Reconciliation, Percent	32.30%	16.40%		32.50%	(240.60%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%		35.00%	35.00%

[1] Certain prior period amounts have been reclassified to conform with the current period presentation.

[2] Primarily 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.