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Fair Value (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Derivatives, Fair Value [Line Items]      
Other noninterest-bearing investments valued under the cost method $ 12   $ 13
Federal Home Loan Bank Stock and Federal Reserve Bank Stock 293   211
Net gains on sale of OREO properties 0 $ 1  
Principal amount of other real estate owned property sold 2    
Equity Method Investments, Fair Value Disclosure 38   35
OREO Properties [Member]      
Derivatives, Fair Value [Line Items]      
Net gains on sale of OREO properties   $ 2  
Fair Value, Inputs, Level 2 [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of AFS securities 15,473   13,188
Fair Value, Inputs, Level 3 [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of AFS securities 0   $ 0
Third Party Pricing Service [Member] | Fair Value, Inputs, Level 2 [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of AFS securities $ 0