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Litigation and Regulatory Matters - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Feb. 28, 2019
Mar. 31, 2019
Mar. 31, 2018
Loss Contingencies [Line Items]      
Expense related to various legal matters   $ 0 $ 494,000,000
Estimate of reasonably possible loss   $ 400,000,000  
Mortgage Securitization Trust Litigation [Member]      
Loss Contingencies [Line Items]      
Damages sought $ 59,000,000