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
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Debt issuance costs $ (16) $ (17)
Total debt 700 835
Collateral Pledged    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Restricted cash 23 35
Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total collateral pledged against our nonrecourse debt 921 1,105
Other Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Other non-recourse debt 77 125
Anticipated Balance at Maturity 18  
Carrying Value of Assets Pledged, Receivables $ 77 178
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%  
HASI Sustainable Yield Bond 2013-1 | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 0 55
Interest Rate 2.79%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 0 76
HASI Sustainable Yield Bond 2015-1A | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 85 90
Interest Rate 4.28%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 126 135
HASI Sustainable Yield Bond 2015-1B Note | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 13 13
Interest Rate 5.41%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Other 126 135
2017 Credit Agreement | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 61 112
Interest Rate 4.12%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Other 120 151
HASI SYB Loan Agreement 2015-2 | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 28 32
Interest Rate 6.01%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Other $ 73 72
HASI SYB Loan Agreement 2015-2 | Interest Rate Swap | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Derivative rate 2.55%  
HASI SYB Trust 2016-2 | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 72 77
Interest Rate 4.35%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 76 81
2017 Master Repurchase Agreement | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance 0 56
Anticipated Balance at Maturity 0  
Carrying Value of Assets Pledged, Receivables 2 67
HASI ECON 101 Trust | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 129 133
Interest Rate 3.57%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 135 137
HASI SYB Trust 2017-1 | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 155 159
Interest Rate 3.86%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 206 208
Lannie Mae Series 2019-1 | Asset-Backed Non-recourse Debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 96 0
Interest Rate 3.68%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables $ 106 $ 0