Investment Securities Investment Securities (Gains and Losses on Available-For-Sale Securities) (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]
Securities gains			$ 1		$ 0
Securities losses			0	[1]	(2)	[1]
Net securities (losses) gains	$ 0	$ (2)	$ 1		$ (2)

[1] Charges related to a derivative contract tied to the conversion rate of Visa Class B shares.