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Fair Value (Schedule Of Assets And Liabilities Measured At Fair Value By Class On A Recurring Basis) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure $ 14,904,000,000 $ 14,737,000,000
Debt Securities, Trading, and Equity Securities, FV-NI 316,000,000 106,000,000
Other Assets, Fair Value Disclosure 107,000,000 95,000,000
Assets, Fair Value Disclosure 16,051,000,000 15,619,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value 52,000,000 85,000,000
Other Liabilities, Fair Value Disclosure 107,000,000 95,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure 184,000,000 219,000,000
Principal amount of other real estate owned property sold 1,000,000  
Other noninterest-bearing investments valued under the cost method 10,000,000 10,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock 272,000,000 329,000,000
Equity Method Investments, Fair Value Disclosure 36,000,000 35,000,000
Other Real Estate Owned Properties [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Gains (Losses) on Sales of Other Real Estate 1,000,000  
US Treasury Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 13,599,000,000 13,425,000,000
Asset-backed Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 22,000,000 21,000,000
Interest Rate Swaps For Customers [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 69,000,000 40,000,000
Other Liabilities, Fair Value Disclosure 22,000,000 36,000,000
Available-for-sale Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 1,283,000,000 1,291,000,000
Derivative [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 1,000,000 1,000,000
Other Liabilities, Fair Value Disclosure 1,000,000 1,000,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 311,000,000 153,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure 161,000,000 182,000,000
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 15,616,000,000 15,346,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure 23,000,000 37,000,000
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets, Fair Value Disclosure 124,000,000 120,000,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Bank-owned life insurance [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Noninterest Bearing Investments Fair Value Disclosure 518,000,000 516,000,000
Private Equity Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Noninterest Bearing Investments Fair Value Disclosure 107,000,000 102,000,000
Assets, Fair Value Disclosure 0 1,000,000
Interest-Only-Strip [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 17,000,000 18,000,000
Designated as Hedging Instrument [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 9,000,000  
Foreign Exchange Contract [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 3,000,000 4,000,000
Other Liabilities, Fair Value Disclosure 2,000,000 2,000,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 40,000,000 40,000,000
Debt Securities, Trading, and Equity Securities, FV-NI 161,000,000 14,000,000
Other Assets, Fair Value Disclosure   95,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value 52,000,000 85,000,000
Fair Value, Inputs, Level 1 [Member] | Warranty, Rights and Obligations, Fair Value Option [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 107,000,000  
Other Liabilities, Fair Value Disclosure 107,000,000 95,000,000
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 40,000,000 40,000,000
Fair Value, Inputs, Level 1 [Member] | Derivative [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 3,000,000 4,000,000
Other Liabilities, Fair Value Disclosure 2,000,000 2,000,000
Fair Value, Inputs, Level 1 [Member] | Private Equity Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Noninterest Bearing Investments Fair Value Disclosure  
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 14,864,000,000 14,697,000,000
Debt Securities, Trading, and Equity Securities, FV-NI 155,000,000 92,000,000
Financial Instruments Sold, Not yet Purchased, at Fair Value 0 0
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 13,559,000,000 13,385,000,000
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 22,000,000 21,000,000
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swaps For Customers [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 69,000,000 40,000,000
Other Liabilities, Fair Value Disclosure 22,000,000 36,000,000
Fair Value, Inputs, Level 2 [Member] | Derivative Interest Rate Related And Other [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 1,000,000 1,000,000
Other Liabilities, Fair Value Disclosure 1,000,000  
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 1,283,000,000 1,291,000,000
Fair Value, Inputs, Level 2 [Member] | Derivative [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Liabilities, Fair Value Disclosure   1,000,000
Fair Value, Inputs, Level 2 [Member] | Bank-owned life insurance [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Noninterest Bearing Investments Fair Value Disclosure 518,000,000 516,000,000
Fair Value, Inputs, Level 2 [Member] | Private Equity Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Noninterest Bearing Investments Fair Value Disclosure
Assets, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 9,000,000  
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 0 0
Financial Instruments Sold, Not yet Purchased, at Fair Value 0 0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure  
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure
Fair Value, Inputs, Level 3 [Member] | Private Equity Funds [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Noninterest Bearing Investments Fair Value Disclosure 107,000,000 102,000,000
Assets, Fair Value Disclosure 0 1,000,000
Fair Value, Inputs, Level 3 [Member] | Interest-Only-Strip [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Assets, Fair Value Disclosure 17,000,000 18,000,000
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Investments, Fair Value Disclosure $ 0.94 $ 0.95