Short-Term Borrowings (Narrative) (Details) (USD $)	0 Months Ended
	Dec. 31, 2013
Short-term Debt [Line Items]
Number of maturity days of short-term borrowings, maximum	30
Percentage of outstanding advance for unencumbered collateral	100.00%
Amount available for FHLB advances	$ 11,000,000,000
Short-term FHLB advances	0
Example1 of term repurchase security agreement term	30
Term repurchase securitiy agreement term example2	60
Amount available for federal reserve borrowings	$ 5,300,000,000