Premises and Equipment Leases (Details) $ in Millions	Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 205
Operating Leases, Future Minimum Payments, Due in Two Years	193
Operating Leases, Future Minimum Payments, Due in Three Years	179
Operating Leases, Future Minimum Payments, Due in Four Years	159
Operating Leases, Future Minimum Payments, Due in Five Years	148
Operating Leases, Future Minimum Payments, Due Thereafter	727
Operating Leases, Future Minimum Payments Due	$ 1,611