Loans and Leases (Schedule of Activity In The Allowance For Loan Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 22	$ 22	$ 100
Charge-offs	0	0	(78)
Provisions	6	(3)	0
Recoveries	0	3	0
Ending balance	28	22	22
Institutional
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	22
Charge-offs	0
Provisions	6
Recoveries	0
Ending balance	28
Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0
Charge-offs	0
Provisions	0
Recoveries	0
Ending balance	$ 0