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Loans and Allowances for Credit Losses, Troubled Debt Restructurings (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled Debt Restructuring, Recorded Investment $ 149.0   $ 132.0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms 54.0   57.0
Financing Receivable, Troubled Debt Restructuring, Postmodification 28.0 $ 18.0  
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down 2.0 $ 8.3  
US Government Agency Insured Loans [Member] | Residential mortgage [Member] | Performing [Member] | Loans to individuals [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Troubled Debt Restructuring, Recorded Investment $ 92.0   $ 92.0