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Fair Value (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivatives, Fair Value [Line Items]          
Lock-up period (in days) 180 days        
Private equity investments carried at cost $ 16,000,000   $ 16,000,000   $ 8,000,000
Federal Reserve and Federal Home Loan Bank stock 108,000,000   108,000,000   109,000,000
Private equity investments accounted for under the equity method 66,000,000   66,000,000   $ 61,000,000
Fair Value, Nonrecurring          
Derivatives, Fair Value [Line Items]          
Gains (losses) from fair value changes (less than) 1,000,000 $ 1,000,000 1,000,000 $ 1,000,000  
Recursion Pharmaceuticals, Inc.          
Derivatives, Fair Value [Line Items]          
Unrealized gain for investment 63,000,000        
Other real estate owned properties          
Derivatives, Fair Value [Line Items]          
Net gains on sale of OREO properties (less than) 1,000,000 1,000,000 1,000,000 1,000,000  
Carrying value of OREO properties 2,000,000 3,000,000 2,000,000 3,000,000  
Impairments of OREO properties (less than during the six months ended June 30, 2020) $ 0 $ 1,000,000 $ 0 $ 1,000,000