Investments in Securities Other-than-temporary Impairments 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Unrealized noncredit loss (gain) recognized in Other Comprehensive Income	$ 118	$ (402)	$ 306
Available-for-sale Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	9,214	8,915
Additions for the credit component on debt securities for which OTTI was not previously recognized	20	15
Additions for the credit component on debt securities for which OTTI was previously recognized	10	698
Reductions for securities no longer in portfolio at period end	(543)	(5)
Reductions for securities which we intend to sell or it is more likely than not that we will be required to sell before recovery of amortized cost basis	(399)	0
(Reductions) additions for amortization resulting from changes in cash flows expected to be collected over the remaining life of the securities	(398)	(409)
Balance, end of period	$ 7,904	$ 9,214