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Non-consolidated variable interest entities - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
NumberOfVIE
Dec. 31, 2019
USD ($)
Mar. 31, 2013
USD ($)
Sep. 30, 2011
USD ($)
Variable Interest Entity        
Number of VIEs | NumberOfVIE 3      
PRLP 2011 Holding, LLC        
Variable Interest Entity        
Equity Method Investment Ownership Percentage 24.90%     24.90%
Cash Received From Investee       $ 48
PR Asset Portfolio 2013-1 International, LLC        
Variable Interest Entity        
Equity Method Investment Ownership Percentage 24.90%   24.90%  
Cash Received From Investee     $ 92  
FNMA, GNMA, FHLMC VIE        
Variable Interest Entity        
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement $ 9,800 $ 9,900