Loans and Leases (Schedule of Activity In The Allowance For Loan Losses) (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
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 30	$ 22	$ 28	$ 22
Allowance for Loan and Lease Losses, Write-offs	0	0	0	0
Provisions	2	0	4	0
Financing Receivable, Allowance for Credit Losses, Recovery	0	0	0	0
Ending balance	32	22	32	22
Institutional
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	30		28	22
Allowance for Loan and Lease Losses, Write-offs	0	0	0	0
Provisions	2	0	4	0
Financing Receivable, Allowance for Credit Losses, Recovery	0	0	0	0
Ending balance	32	22	32	22
Commercial Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0		0	0
Allowance for Loan and Lease Losses, Write-offs	0	0	0	0
Provisions	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	0	0	0	0
Ending balance	$ 0	$ 0	$ 0	$ 0