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
Mar. 31, 2021
Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Unamortized financing costs $ (11) $ (12)
Total non-recourse debt 463 593
Asset-backed non-recourse debt | HASI Sustainable Yield Bond 2015-1A    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Senior Notes $ 80 81
Interest rate 4.28%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, receivables 133 134
Asset-backed non-recourse debt | HASI Sustainable Yield Bond 2015-1B Note (2)    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Senior Notes $ 13 13
Interest rate 5.41%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, other 133 134
Asset-backed non-recourse debt | HASI SYB Trust 2016-2    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Senior Notes $ 68 67
Interest rate 4.35%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, receivables 70 71
Asset-backed non-recourse debt | HASI ECON 101 Trust (3)    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Senior Notes $ 0 126
Interest rate 3.57%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, receivables 0 133
Asset-backed non-recourse debt | HASI SYB Trust 2017-1    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Senior Notes $ 150 150
Interest rate 3.86%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, receivables 204 205
Asset-backed non-recourse debt | Lannie Mae Series 2019-01    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Convertible Senior Notes $ 94 95
Interest rate 3.68%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, receivables 108 107
Other non-recourse debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Other non-recourse debt 69 73
Anticipated Balance at Maturity 18  
Carrying value of assets pledged, receivables $ 69 $ 73
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%