Financial Derivatives (Risk Participation Agreements Sold) (Details) (Risk Participation Agreements Sold [Member], USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Risk Participation Agreements Sold [Member]
Credit Derivatives [Line Items]
Notional Amount	$ 2,863	$ 2,770
Fair Value	$ (3)	$ (4)
Average term of credit risk derivatives	5 years 7 months	6 years 1 month