Loans And Leases (Financing Receivables On Non-Accrual Status) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Loans and leases receivable, recorded investment on non-accrual status	$ 57	$ 158
Property Development [Member]
Loans and leases receivable, recorded investment on non-accrual status	52	79
Property Development Acquired Credit-Impaired [Member]
Loans and leases receivable, recorded investment on non-accrual status		42
Other Acquired Credit-Impaired [Member]
Loans and leases receivable, recorded investment on non-accrual status	5	22
Other [Member]
Loans and leases receivable, recorded investment on non-accrual status		$ 15