Annual report pursuant to Section 13 and 15(d)

Outstanding Loans and Leases - Consumer Real Estate - Modification Programs (Details)

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Outstanding Loans and Leases - Consumer Real Estate - Modification Programs (Details) - Consumer real estate - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications $ 478,000,000 $ 999,000,000 $ 1,302,000,000
Modifications under government programs      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications 35,000,000 61,000,000 85,000,000
Modifications under proprietary programs      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications 174,000,000 523,000,000 437,000,000
Loans discharged in Chapter 7 bankruptcy      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications 68,000,000 130,000,000 211,000,000
Trial modifications      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications 201,000,000 285,000,000 569,000,000
Hurricane-Related Modifications | Modifications under government programs      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Total modifications $ 0 $ 198,000,000 $ 0