Investments in Securities Available-for-sale Securities 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 96		$ 1,338		$ 495		$ 1,520
Gross realized losses	(4)		(884)		(5)		(941)
Total proceeds	$ 722	[1]	$ 12,243	[1]	$ 2,461	[1]	$ 14,013	[1]

[1] Excludes proceeds from the initial sale of securities from new portfolio securitizations included in “Note 2, Consolidations and Transfers of Financial Assets.”