Investments in Securities Available-for-sale Securities 1 (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 1,338		$ 5		$ 1,520		$ 32
Gross realized losses	884		3		941		13
Total proceeds	$ 12,243	[1]	$ 44	[1]	$ 14,013	[1]	$ 444	[1]

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