Investments in Securities Available-for-sale Securities 1 (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
Investments, Debt and Equity Securities [Abstract]
Gross realized gains	$ 396		$ 173		$ 399		$ 182
Gross realized losses	0		53		2		57
Total proceeds	$ 1,705	[1]	$ 1,676	[1]	$ 1,740	[1]	$ 1,770	[1]

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