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) - USD ($)
 12 Months Ended
Apr. 07, 2017
Jan. 09, 2017
Jul. 21, 2015
Dec. 30, 2014
Sep. 28, 2010
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]              
Litigation settlement expense           $ 681,000,000 $ 469,000,000
Minimum              
Loss Contingencies [Line Items]              
Estimated range of possible loss           0  
Maximum              
Loss Contingencies [Line Items]              
Estimated range of possible loss           $ 1,600,000,000  
Ambac Countrywide Litigation, Claim One              
Loss Contingencies [Line Items]              
Damages sought         $ 2,200,000,000    
Ambac Countrywide Litigation, Claim Two              
Loss Contingencies [Line Items]              
Damages sought       $ 600,000,000      
Ambac Countrywide Litigation, Claim Four              
Loss Contingencies [Line Items]              
Damages sought     $ 350,000,000        
Bank of America, N.A. | FDIC Deposit Insurance Assessments              
Loss Contingencies [Line Items]              
Damages sought $ 583,000,000 $ 542,000,000