Fair Value (Fair Value Option) (Narrative) (Details) (USD $) In Millions, unless otherwise specified					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Mortgage Loans Held-for-sale [Member]	Dec. 31, 2012 Mortgage Loans Held-for-sale [Member]	Dec. 31, 2012 Mortgage Loans Held-for-sale [Member] Other Revenues [Member]	Dec. 31, 2011 Mortgage Loans Held-for-sale [Member] Other Revenues [Member]	Dec. 31, 2013 Mortgage Loans Held-for-sale [Member] Other Revenues [Member] Maximum [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage loans held-for-sale	$ 3	$ 414	$ 0	$ 49
Instrument-specific credit risk					(1)	(3)	(1)
Other changes in estimated fair value					$ 68	$ 511	$ 1