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Legal Actions (Details)
$ in Millions
3 Months Ended 180 Months Ended
Jul. 13, 2012
USD ($)
Dec. 31, 2016
USD ($)
Apr. 20, 2017
USD ($)
Oct. 24, 2018
USD ($)
Oct. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
legal_action
Jul. 31, 2017
Nov. 17, 2016
legal_action
Dec. 31, 2015
legal_action
Legal Actions (Textual) [Abstract]                  
RMBS trusts at issue in the State Court Action             11    
ATM Access Fee Litigation [Member]                  
Legal Actions (Textual) [Abstract]                  
Loss Contingency, Pending Claims, Number | legal_action               3  
Automobile Lending Practices [Member]                  
Legal Actions (Textual) [Abstract]                  
Loss Contingency, Pending Claims, Number | legal_action           1      
Interchange Litigation [Member]                  
Loss Contingencies [Line Items]                  
Litigation Settlement, Percentage Of Default Interchange Distributed To Class Merchants 0.10%                
Legal Actions (Textual) [Abstract]                  
Loss Contingency, Estimate of Possible Loss $ 6,600.0                
Litigation Settlement, Default Interchange Distributed To Class Merchants, Distribution Period 8 months                
Litigation Settlement, Expense   $ 6,200.0              
Litigation Settlement, Funds Remaining from 2012   5,300.0              
Litigation Settlement, Additional Funding   900.0              
Litigation Settlement, Additional Funding Allocated to WFC   $ 94.5              
Mortgage Interest Rate Lock [Member]                  
Legal Actions (Textual) [Abstract]                  
Loss Contingency, Pending Claims, Number | legal_action           2      
Civil Money Penalty           $ 1,000.0      
Mortgage Related Regulatory Investigations [Member]                  
Legal Actions (Textual) [Abstract]                  
Settlement Liabilities, Current           2,090.0      
RMBS Trustee Litigation [Member]                  
Legal Actions (Textual) [Abstract]                  
Loss Contingency, Pending Claims, Number | legal_action                 4
Sales Practice Matters [Member]                  
Legal Actions (Textual) [Abstract]                  
Amounts To Be Paid In Connection With Legal Or Regulatory Matters     $ 142.0            
Unauthorized accounts identified     3,500,000            
Sales Practice Matters [Member] | All Class Members [Member]                  
Legal Actions (Textual) [Abstract]                  
Amounts To Be Paid In Connection With Legal Or Regulatory Matters     $ 25.0            
Payments for Legal Settlements     $ 480.0            
Liability for Contingent Litigation Losses [Member]                  
Legal Actions (Textual) [Abstract]                  
Range of possible loss, portion not accrued           $ 2,200.0      
Subsequent Event [Member] | Mortgage Bankruptcy Loan Modification Litigation [Member]                  
Legal Actions (Textual) [Abstract]                  
Loss Contingency, Estimate of Possible Loss       $ 13.5          
NEW YORK | Subsequent Event [Member] | Sales Practice Matters [Member]                  
Legal Actions (Textual) [Abstract]                  
Loss Contingency, Estimate of Possible Loss         $ 65.0