Annual report pursuant to Section 13 and 15(d)

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

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Our Portfolio - Analysis of Portfolio by Type of Obligor and Credit Quality (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
transaction
Dec. 31, 2018
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 498,631,000 $ 471,044,000
Receivables 1,159,000,000  
Real estate 384,000,000  
Investments 74,530,000 169,793,000
Total 2,095,000,000  
Average remaining balance 11,000,000  
Financing receivables on non accrual status $ 0 $ 0
Number of transactions | transaction 140  
Average remaining balance (less than) $ 11,000,000  
Total aggregate remaining balance 49,000,000  
Equity investments in renewable energy and energy efficiency projects    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments 477,000,000  
External Credit Rating, Investment Grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 8,000,000  
Commercial Investment Grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 209,000,000  
Real estate 362,000,000  
Investments 42,000,000  
Total 613,000,000  
Average remaining balance 7,000,000  
Average remaining balance (less than) $ 7,000,000  
Commercial Investment Grade | Credit Concentration Risk | Debt and real estate portfolio    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 38.00%  
Commercial Investment Grade | Equity investments in renewable energy and energy efficiency projects    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Commercial Non-Investment Grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 687,000,000  
Real estate 0  
Investments 0  
Total 687,000,000  
Average remaining balance 20,000,000  
Increase in finance receivables 236,000,000  
Average remaining balance (less than) $ 20,000,000  
Commercial Non-Investment Grade | Credit Concentration Risk | Debt and real estate portfolio    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 43.00%  
Commercial Non-Investment Grade | Equity investments in renewable energy and energy efficiency projects    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Government    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 263,000,000  
Real estate 0  
Investments 33,000,000  
Total 296,000,000  
Average remaining balance 7,000,000  
Average remaining balance (less than) $ 7,000,000  
Government | Credit Concentration Risk | Debt and real estate portfolio    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 19.00%  
Government | Equity investments in renewable energy and energy efficiency projects    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Subtotal, Debt and Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 1,159,000,000  
Real estate 362,000,000  
Investments 75,000,000  
Total 1,596,000,000  
Average remaining balance 10,000,000  
Average remaining balance (less than) $ 10,000,000  
Subtotal, Debt and Real Estate | Credit Concentration Risk | Debt and real estate portfolio    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Debt and real estate portfolio 100.00%  
Subtotal, Debt and Real Estate | Equity investments in renewable energy and energy efficiency projects    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments $ 0  
Equity Method Investments    
Financing Receivable, Credit Quality Indicator [Line Items]    
Receivables 0  
Real estate 22,000,000  
Investments 0  
Total 499,000,000  
Average remaining balance 19,000,000  
Average remaining balance (less than) 19,000,000  
Equity Method Investments | Equity investments in renewable energy and energy efficiency projects    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments 477,000,000  
U.S. Federal Government    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total financing receivable 186,000,000  
State, Local, Institutions    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total financing receivable 110,000,000  
Leasing Arrangement | Commercial Non-Investment Grade    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 89,000,000  
Residential Solar Loan    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans receivable 451,000,000  
Residential Solar Loan | Affiliated Entity    
Financing Receivable, Credit Quality Indicator [Line Items]    
Equity method investments 40,000,000  
Loans receivable 357,000,000  
Financing receivables on non accrual status 8,000,000  
Maximum    
Financing Receivable, Credit Quality Indicator [Line Items]    
Average remaining balance 1,000,000  
Average remaining balance (less than) $ 1,000,000