Hannon Armstrong Sustainable Infrastructure Capital, Inc. Annual report pursuant to Section 13 and 15(d)

Securitization of Financial Assets - Additional Information (Details)

Securitization of Financial Assets - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Pledged \| Non-recourse
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Gain on deconsolidation	$ 19,000,000
Securitized assets
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Annual servicing fees (up to)	0.25%
Managed assets	$ 12,300,000,000	$ 9,800,000,000
Securitization credit losses	0	0	$ 0
Receivable from contracts	108,000,000
Securitized assets \| Unconsolidated securitization trusts
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Managed assets	6,100,000,000	5,500,000,000
Securitized assets \| Investor \| Asset Management Arrangement \| Unconsolidated securitization trusts
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Managed assets	$ 5,600,000,000	$ 5,300,000,000
Securitized assets \| Discount rate \| Minimum
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Discount rates to determine fair market value of underlying assets	0.056
Securitized assets \| Discount rate \| Maximum
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Discount rates to determine fair market value of underlying assets	0.095