Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Summary of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details)

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Our Portfolio - Summary of the Carrying Value and Allowance by Type of Receivable or "Portfolio Segment" (Details) - USD ($)
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value $ 1,194,000,000   $ 1,250,000,000      
Loan Funding Commitments 268,000,000   282,000,000      
Allowance 37,000,000   36,000,000      
Loans 1,157,000,000          
Equity method investments, receivables, real estate and investments 3,031,000,000          
Financing receivables on non-accrual status 0   0      
Special purpose subsidiaries            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Noncontrolling equity investments 51,000,000          
3            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance 8,000,000          
Government            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 131,000,000   248,000,000      
Loan Funding Commitments 0   0      
Allowance 0 $ 0 0 $ 0 $ 0 $ 0
Loans 130,685,000   248,455,000      
Government | 1            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 131,000,000          
Allowance 0          
Loans 131,000,000          
Equity method investments, receivables, real estate and investments 142,000,000          
U.S. federal government            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 29,000,000          
State or local governments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 102,000,000          
Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 1,063,000,000   1,002,000,000      
Loan Funding Commitments 268,000,000   282,000,000      
Allowance 37,000,000 $ 36,000,000 36,000,000 $ 29,000,000 $ 26,000,000 $ 26,000,000
Loans 1,026,555,000   $ 965,452,000      
Commercial | Special purpose subsidiaries            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 593,000,000          
Commercial | 1            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 1,040,000,000          
Allowance 22,000,000          
Loans 1,018,000,000          
Equity method investments, receivables, real estate and investments 2,856,000,000          
Commercial | 2            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 15,000,000          
Allowance 7,000,000          
Loans 8,000,000          
Equity method investments, receivables, real estate and investments 33,000,000          
Commercial | 3            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 8,000,000          
Allowance 8,000,000          
Loans 0          
Equity method investments, receivables, real estate and investments 0          
Financing receivables on non-accrual status 8,000,000          
Residential solar loan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 565,000,000          
Leasing arrangement            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity method investments, receivables, real estate and investments $ 48,000,000