XML 134 R122.htm IDEA: XBRL DOCUMENT v3.8.0.1
Litigation and Regulatory Matters - Additional Information (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2014
trust
Loss Contingencies [Line Items]    
Expense related to various legal matters $ 494,000,000  
Estimate of reasonably possible loss $ 325,000,000  
Mortgage Securitization Pool Trust Litigation [Member]    
Loss Contingencies [Line Items]    
Number of identified trusts | trust   280