Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Footnotes) (Details)

v3.19.3
Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Footnotes) (Details)
9 Months Ended
Sep. 30, 2019
USD ($)
transaction
Dec. 31, 2018
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivables on non accrual status $ 0 $ 0
Number of transactions | transaction 175  
Financial receivable outstanding $ 9,000,000  
Total aggregate remaining balance 60,000,000  
Maximum [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financial receivable outstanding 1,000,000  
Commercial Non-Investment Grade [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Increase in finance receivables 72,000,000  
Financial receivable outstanding 16,000,000  
Special Purpose Subsidiaries [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Noncontrolling equity investments 19,000,000  
Investment Grade by Independent Rating Agency [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total financing receivable 8,000,000  
U.S. Federal Government [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total financing receivable 223,000,000  
State, Local, Institutions [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total financing receivable 111,000,000  
Residential Solar Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans receivable 445,000,000  
Residential Solar Loan [Member] | Special Purpose Subsidiaries [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans receivable $ 260,000,000