Quarterly report pursuant to Section 13 or 15(d)

Long-term Debt - Schedule of Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Details)

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Long-term Debt - Schedule of Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Unamortized financing costs $ (14) $ (16)
Total non-recourse debt 626 700
Asset-Backed Non-recourse Debt | HASI Sustainable Yield Bond 2015-1A    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 84 85
Interest Rate 4.28%  
Debt Principal Amount Due Upon Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 134 126
Asset-Backed Non-recourse Debt | HASI Sustainable Yield Bond 2015-1B Note    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 13 13
Interest Rate 5.41%  
Debt Principal Amount Due Upon Maturity $ 0  
Carrying Value of Assets Pledged, Other 134 126
Asset-Backed Non-recourse Debt | 2017 Credit Agreement    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 0 61
Interest Rate 4.12%  
Debt Principal Amount Due Upon Maturity $ 0  
Carrying Value of Assets Pledged, Other 0 120
Asset-Backed Non-recourse Debt | HASI SYB Loan Agreement 2015-2    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 23 28
Interest Rate 4.37%  
Debt Principal Amount Due Upon Maturity $ 0  
Carrying Value of Assets Pledged, Other 71 73
Asset-Backed Non-recourse Debt | HASI SYB Trust 2016-2    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 71 72
Interest Rate 4.35%  
Debt Principal Amount Due Upon Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 76 76
Asset-Backed Non-recourse Debt | HASI ECON 101 Trust    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 127 129
Interest Rate 3.57%  
Debt Principal Amount Due Upon Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 132 135
Asset-Backed Non-recourse Debt | HASI SYB Trust 2017-1    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 153 155
Interest Rate 3.86%  
Debt Principal Amount Due Upon Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 206 206
Asset-Backed Non-recourse Debt | Lannie Mae Series 2019-01    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 96 96
Interest Rate 3.68%  
Carrying Value of Assets Pledged, Receivables $ 108 106
Other Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Other non-recourse debt 73 77
Debt Principal Amount Due Upon Maturity 18  
Carrying Value of Assets Pledged, Receivables $ 73 $ 77
Other Non-recourse Debt | Maximum    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest Rate 7.23%