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Fair Value (Additional Fair Value Information Related To Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Carrying Amount [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings    
Cash and due from banks $ 3,861 $ 4,065
Short-term assets 31,787 32,959
Securities held to maturity 15,154 14,768
Loans held for sale 106 56
Net loans (excludes leases) 196,280 195,579
Other assets 1,767 1,817
Total assets 248,955 249,244
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Borrowed funds 53,545 53,761
Unfunded loan commitments and letters of credit 263 245
Other Liabilities 53  
Total liabilities 304,220 303,008
Carrying Amount [Member] | Demand, savings and money market deposits [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Deposits 231,304 228,492
Carrying Amount [Member] | Time deposits [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Deposits 19,055 20,510
Fair Value [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings    
Cash and due from banks 3,861 4,065
Short-term assets 31,787 32,959
Securities held to maturity 15,608 15,002
Loans held for sale 109 56
Net loans (excludes leases) 199,002 197,611
Other assets 2,298 2,408
Total assets 252,665 252,101
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Borrowed funds 54,109 54,002
Unfunded loan commitments and letters of credit 263 245
Other Liabilities 53  
Total liabilities 304,861 303,210
Fair Value [Member] | Demand, savings and money market deposits [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Deposits 231,304 228,492
Fair Value [Member] | Time deposits [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Deposits 19,132 20,471
Fair Value [Member] | Level 1 [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings    
Cash and due from banks 3,861 4,065
Securities held to maturity 317 298
Total assets 4,178 4,363
Fair Value [Member] | Level 2 [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings    
Short-term assets 31,787 32,959
Securities held to maturity 15,285 14,698
Loans held for sale 94 22
Other assets 1,748 1,786
Total assets 48,914 49,465
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Borrowed funds 52,775 52,578
Other Liabilities 53  
Total liabilities 303,264 301,541
Fair Value [Member] | Level 2 [Member] | Demand, savings and money market deposits [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Deposits 231,304 228,492
Fair Value [Member] | Level 2 [Member] | Time deposits [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Deposits 19,132 20,471
Fair Value [Member] | Level 3 [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings    
Securities held to maturity 6 6
Loans held for sale 15 34
Net loans (excludes leases) 199,002 197,611
Other assets 550 622
Total assets 199,573 198,273
Financial Instruments, Financial Liabilities, Balance Sheet Groupings    
Borrowed funds 1,334 1,424
Unfunded loan commitments and letters of credit 263 245
Total liabilities $ 1,597 $ 1,669