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
Sep. 30, 2020
Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Unamortized financing costs $ (13) $ (16)
Total non-recourse debt 600 700
Asset-backed non-recourse debt | HASI Sustainable Yield Bond 2015-1A    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of convertible notes $ 83 85
Interest rate 4.28%  
Anticipated Balance at 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]    
Carrying value of convertible notes $ 13 13
Interest rate 5.41%  
Anticipated Balance at 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]    
Carrying value of convertible notes 0 61
Anticipated Balance at 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]    
Carrying value of convertible notes 0 28
Anticipated Balance at Maturity 0  
Carrying Value of Assets Pledged, Other 0 73
Asset-backed non-recourse debt | HASI SYB Trust 2016-2    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of convertible notes $ 72 72
Interest rate 4.35%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 72 76
Asset-backed non-recourse debt | HASI ECON 101 Trust    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of convertible notes $ 126 129
Interest rate 3.57%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 133 135
Asset-backed non-recourse debt | HASI SYB Trust 2017-1    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of convertible notes $ 152 155
Interest rate 3.86%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 205 206
Asset-backed non-recourse debt | Lannie Mae Series 2019-01    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of convertible notes $ 95 96
Interest rate 3.68%  
Anticipated Balance at Maturity $ 0  
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 72 77
Anticipated Balance at Maturity 18  
Carrying Value of Assets Pledged, Receivables $ 72 $ 77
Other non-recourse debt | Minimum    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest rate 3.15%  
Other non-recourse debt | Maximum    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest rate 7.45%