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 ($)
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value $ 1,390,000,000   $ 1,250,000,000      
Loan Funding Commitments 290,000,000   282,000,000      
Allowance 39,000,000   36,000,000      
Loans 1,351,000,000          
Equity method investments, receivables, real estate and investments 3,194,000,000          
Financing receivables on non-accrual status 0   0      
3            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance 8,000,000          
Special purpose subsidiaries            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Noncontrolling equity investments 76,000,000          
Government            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 126,000,000   248,000,000      
Loan Funding Commitments 0   0      
Allowance 0 $ 0 0 $ 0 $ 0 $ 0
Loans 126,412,000   248,455,000      
Government | 1            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 126,000,000          
Allowance 0          
Loans 126,000,000          
Equity method investments, receivables, real estate and investments 137,000,000          
Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 1,264,000,000   1,002,000,000      
Loan Funding Commitments 290,000,000   282,000,000      
Allowance 39,000,000 $ 37,000,000 36,000,000 $ 31,000,000 $ 29,000,000 $ 26,000,000
Loans 1,224,741,000   $ 965,452,000      
Commercial | 2            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 14,000,000          
Allowance 5,000,000          
Loans 9,000,000          
Equity method investments, receivables, real estate and investments 35,000,000          
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          
Commercial | 1            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Gross Carrying Value 1,242,000,000          
Allowance 26,000,000          
Loans 1,216,000,000          
Equity method investments, receivables, real estate and investments 3,022,000,000          
Commercial | Special purpose subsidiaries            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 647,000,000          
U.S. federal government            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 28,000,000          
State or local governments            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 98,000,000          
Residential solar loan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans 742,000,000          
Leasing arrangement            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Equity method investments, receivables, real estate and investments $ 47,000,000