Investments in Securities Other-than-temporary Impairments 2 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Net other-than-temporary impairments recognized in earnings related to securities in which we had the change in intent to sell before recovery of the amortized cost basis of securities									$ 34
Net other-than-temporary impairments	22	27	6	9	12	38	599	64	64	[1]	713	308
Alt-A private-label securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Net other-than-temporary impairments									34		365	563
Subprime private-label securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Net other-than-temporary impairments									5		329	(303)
Other mortgage-related securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Net other-than-temporary impairments									$ 25		$ 19	$ 48

[1] Includes $34 million of other-than-temporary impairments recognized in earnings for the year ended December 31, 2013, related to our intent to sell the related securities before recovery of their amortized cost basis.