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
Sep. 30, 2019
Dec. 31, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Debt issuance costs $ (15) $ (17)
Total non-recourse debt 665 835
Asset-Backed Non-recourse Debt [Member] | HASI Sustainable Yield Bond 2013-1 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 0 55
Interest Rate 2.79%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 0 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 $ 87 90
Interest Rate 4.28%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 127 135
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  
Carrying Value of Assets Pledged, Other 127 135
Asset-Backed Non-recourse Debt [Member] | 2017 Credit Agreement [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 77 112
Interest Rate 4.12%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Other 93 151
Asset-Backed Non-recourse Debt [Member] | HASI SYB Loan Agreement 2015-2 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 29 32
Interest Rate 6.17%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Other 73 72
Asset-Backed Non-recourse Debt [Member] | HASI SYB Trust 2016-2 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 76 77
Interest Rate 4.35%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 77 81
Asset-Backed Non-recourse Debt [Member] | 2017 Master Repurchase Agreement [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 0 56
Interest Rate 0.00%  
Anticipated Balance at Maturity $ 0  
Carrying Value of Assets Pledged, Receivables 62 67
Asset-Backed Non-recourse Debt [Member] | HASI ECON 101 Trust [Member]    
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 134 137
Asset-Backed Non-recourse Debt [Member] | HASI SYB Trust 2017-1 [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Outstanding Balance $ 156 159
Interest Rate 3.86%  
Anticipated Balance at Maturity $ 0  
Carrying 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 113 125
Anticipated Balance at Maturity 18  
Carrying Value of Assets Pledged, Receivables $ 114 $ 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%