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

Fair Value Measurements - Additional Information (Details) - Level 3	Mar. 31, 2023	Dec. 31, 2022
Risk free interest rate \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, measurement input	0.01	0.01
Risk free interest rate \| Minimum \| Securitization residual assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, measurement input	0.01
Risk free interest rate \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, measurement input	0.04	0.04
Risk free interest rate \| Maximum \| Securitization residual assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, measurement input		0.06
Weighted average discount rate
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, measurement input	0.062	0.065
Weighted average discount rate \| Securitization residual assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments, measurement input	0.063	0.068