Annual report pursuant to Section 13 and 15(d)

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

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Long-term Debt - Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Unamortized financing costs $ (10) $ (12)
Total non-recourse debt 430 593
Loss on sale of assets 3  
Collateral Pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Restricted cash 24 23
Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total collateral pledged against our nonrecourse debt 573 723
Asset-Backed Non-recourse Debt | HASI Sustainable Yield Bond 2015-1A    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Senior Unsecured Notes $ 77 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 Senior Unsecured Notes $ 0 13
Interest Rate 5.41%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, other 0 134
Asset-Backed Non-recourse Debt | HASI SYB Trust 2016-2    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Senior Unsecured Notes $ 62 67
Interest Rate 4.35%  
Anticipated Balance at Maturity $ 0  
Carrying value of assets pledged, receivables 65 71
Asset-Backed Non-recourse Debt | HASI ECON 101 Trust    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Senior Unsecured 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 Senior Unsecured Notes $ 146 150
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 2019-1    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Carrying value of Senior Unsecured 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 62 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%