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, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Annual servicing fees (up to)	0.20%
Managed assets	$ 8,800,000,000	$ 7,200,000,000
Securitization credit losses	0	0	$ 0
Payment from debtors to securitization trust	210,354,000	164,342,000
Greater than 90 days past due
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Payment from debtors to securitization trust	0
Securitized assets
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Managed receivables	5,200,000,000	$ 4,300,000,000
Residual and servicing assets \| Securitization Trust
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Receivable from contracts	$ 104,000,000
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	0.02
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	0.08