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, 2019
Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Debt issuance costs $ (16) $ (17)
Total non-recourse debt 815 835
Asset-Backed Non-recourse Debt [Member] | HASI Sustainable Yield Bond 2013-1 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 38 55
Interest Rate 2.79%  
Anticipated Balance at Maturity $ 35  
Value of Assets Pledged, Receivables 48 76
Asset-Backed Non-recourse Debt [Member] | HASI Sustainable Yield Bond 2015-1A [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 89 90
Interest Rate 4.28%  
Anticipated Balance at Maturity $ 0  
Value of Assets Pledged, Receivables 135 135
Asset-Backed Non-recourse Debt [Member] | HASI Sustainable Yield Bond 2015-1B Note [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 13 13
Interest Rate 5.41%  
Anticipated Balance at Maturity $ 0  
Value of Assets Pledged, Other 135 135
Asset-Backed Non-recourse Debt [Member] | 2017 Credit Agreement [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 103 112
Interest Rate 4.12%  
Anticipated Balance at Maturity $ 0  
Value of Assets Pledged, Other 116 151
Asset-Backed Non-recourse Debt [Member] | HASI SYB Loan Agreement 2015-2 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 30 32
Interest Rate 6.67%  
Anticipated Balance at Maturity $ 0  
Value of Assets Pledged, Other 71 72
Asset-Backed Non-recourse Debt [Member] | HASI SYB Trust 2016-2 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 78 77
Interest Rate 4.35%  
Anticipated Balance at Maturity $ 0  
Value of Assets Pledged, Receivables 81 81
Asset-Backed Non-recourse Debt [Member] | 2017 Master Repurchase Agreement [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 61 56
Interest Rate 5.11%  
Anticipated Balance at Maturity $ 57  
Value of Assets Pledged, Receivables 72 67
Asset-Backed Non-recourse Debt [Member] | HASI ECON 101 Trust [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 133 133
Interest Rate 3.57%  
Anticipated Balance at Maturity $ 0  
Value of Assets Pledged, Receivables 137 137
Asset-Backed Non-recourse Debt [Member] | HASI SYB Trust 2017-1 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 158 159
Interest Rate 3.86%  
Anticipated Balance at Maturity $ 0  
Value of Assets Pledged, Receivables 207 208
Other Non-recourse Debt [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Other non-recourse debt 128 125
Anticipated Balance at Maturity 18  
Value of Assets Pledged, Receivables $ 174 $ 178
Other Non-recourse Debt [Member] | Minimum [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest Rate 3.15%  
Other Non-recourse Debt [Member] | Maximum [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest Rate 7.45%