Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Litigation and Regulatory Matters (Details)

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Commitments and Contingencies - Litigation and Regulatory Matters (Details)
 1 Months Ended 12 Months Ended
Jan. 09, 2017
USD ($)
Oct. 01, 2015
USD ($)
Aug. 12, 2015
USD ($)
Dec. 30, 2014
USD ($)
Sep. 02, 2014
summon
trust
Oct. 19, 2012
USD ($)
Sep. 29, 2010
USD ($)
Mar. 11, 2015
trust
Dec. 31, 2016
USD ($)
lawsuit
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]                    
Litigation settlement expense                 $ 1,200,000,000 $ 1,200,000,000
Ambac Bond Insurance Litigation                    
Loss Contingencies [Line Items]                    
Number of filed lawsuits | lawsuit                 5  
Ambac Countrywide Litigation, Claim One                    
Loss Contingencies [Line Items]                    
Damages sought (more than)             $ 2,200,000,000      
Ambac Countrywide Litigation, Claim Two                    
Loss Contingencies [Line Items]                    
Damages sought (more than)       $ 600,000,000            
Ambac Countrywide Litigation, Claim Three                    
Loss Contingencies [Line Items]                    
Damages sought (more than)       $ 350,000,000            
In Re Payment Card Interchange Fee and Merchant Discount Anti-Trust Litigation (Interchange)                    
Loss Contingencies [Line Items]                    
Total litigation settlement for group of defendants           $ 6,600,000,000        
Distribution to class merchants, as a percentage of default           0.10%        
Period of default           8 months        
Pennsylvania Public School Employees' Retirement System                    
Loss Contingencies [Line Items]                    
Settlement payment     $ 335,000,000              
U.S. Dollar LIBOR Contributions Litigation                    
Loss Contingencies [Line Items]                    
Total litigation settlement for group of defendants   $ 187,500,000                
U.S. Bank Summonses with Notice Litigation                    
Loss Contingencies [Line Items]                    
Litigation Settlement, Number of Trusts Involved In Settlement Agreement | trust         7          
Loss Contingency, New Claims Filed, Number | summon         7          
Litigation Settlement, Number of Complaints Served on Trusts Involved In Settlement Agreement | trust               4    
Minimum                    
Loss Contingencies [Line Items]                    
Estimate of possible loss                 $ 0  
Maximum                    
Loss Contingencies [Line Items]                    
Estimate of possible loss                 $ 1,500,000,000  
Bank of America, N.A. | FDIC Deposit Insurance Assessments | Subsequent Event                    
Loss Contingencies [Line Items]                    
Damages sought (more than) $ 542,000,000