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Fair Value (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Other noninterest-bearing investments valued under the cost method $ 10,000,000  
Fair value of AFS securities 14,737,000,000 $ 15,161,000,000
Principal amount of other real estate owned property sold 4,000,000 6,000,000
Federal Home Loan Bank Stock and Federal Reserve Bank Stock 329,000,000 338,000,000
Equity Method Investments, Fair Value Disclosure 35,000,000 36,000,000
OREO Properties [Member]    
Derivatives, Fair Value [Line Items]    
Net gains on sale of OREO properties 1,000,000 2,000,000
Available-for-sale Securities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of AFS securities 1,291,000,000 1,334,000,000
Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of AFS securities 14,697,000,000 15,065,000,000
Level 2 [Member] | Available-for-sale Securities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of AFS securities 1,291,000,000 1,334,000,000
Fair Value, Inputs, Level 3 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of AFS securities 0 0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of AFS securities
Third Party Pricing Service [Member] | Level 2 [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of AFS securities $ 0.95