Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Nonrecurring Basis) (Details) (Nonrecurring [Member], Level 3, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Loans	$ 128	$ 214
Nonmarketable equity securities	2	2
Other real estate	5	24
Total assets at fair value	135	240
Commercial
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Loans	43	42
Real estate construction
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Loans	20	25
Commercial mortgage
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Loans	61	145
Lease financing
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Loans		2
International
Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis [Line Items]
Loans	$ 4