v3.22.0.1
Loans (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchased loans $ 1,300 $ 1,600
Federal Reserve Bank [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Pledged for Federal Reserve Bank Debt 17,500  
Federal Home Loan Bank (FHLB) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Pledged for Federal Home Loan Bank Debt $ 19,700