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
1 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Unamortized financing costs   $ (11) $ (12)
Total non-recourse debt   438 593
Loss on sale of assets $ 3    
Collateral pledged      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Restricted cash   25 23
Asset-backed non-recourse debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Total collateral pledged against our nonrecourse debt   574 723
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   $ 78 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      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Carrying value of Convertible Senior Notes   $ 0 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   $ 66 67
Interest rate   4.35%  
Anticipated Balance at Maturity   $ 0  
Carrying value of assets pledged, receivables   66 71
Asset-backed non-recourse debt | HASI ECON 101 Trust      
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   $ 147 150
Interest rate   3.86%  
Anticipated Balance at Maturity   $ 0  
Carrying value of assets pledged, receivables   203 205
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   $ 93 95
Interest rate   3.68%  
Anticipated Balance at Maturity   $ 0  
Carrying value of assets pledged, receivables   107 107
Other non-recourse debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Other non-recourse debt   65 73
Anticipated Balance at Maturity   18  
Carrying value of assets pledged, receivables   $ 65 $ 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%