Premises and Equipment Leases (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 208
Capital Leases, Future Minimum Payments Due, Next Twelve Months	2
Operating Leases, Future Minimum Payments, Due in Two Years	196
Capital Leases, Future Minimum Payments Due in Two Years	2
Operating Leases, Future Minimum Payments, Due in Three Years	190
Capital Leases, Future Minimum Payments Due in Three Years	2
Operating Leases, Future Minimum Payments, Due in Four Years	171
Capital Leases, Future Minimum Payments Due in Four Years	2
Operating Leases, Future Minimum Payments, Due in Five Years	91
Capital Leases, Future Minimum Payments Due in Five Years	2
Operating Leases, Future Minimum Payments, Due Thereafter	354
Capital Leases, Future Minimum Payments Due Thereafter	3
Operating Leases, Future Minimum Payments Due	1,210
Capital Leases, Future Minimum Payments Due	13
Capital Leases, Future Minimum Payments, Interest Included in Payments	3
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	$ 10	[1]

[1] Amounts do not include accrued interest.