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Preferred stock, par value $0.01 per share, 50,000,000 shares authorized, no shares issued and outstanding Preferred Stock, Value, Issued Unconsolidated Securitization Trusts Unconsolidated Securitization Trusts [Member] Unconsolidated Securitization Trusts Adjustment to Compensation: Adjustment to Compensation [Axis] Amounts released into interest expense Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax June 2056 Junior Subordinated Notes June 2056 Junior Subordinated Notes [Member] June 2056 Junior Subordinated Notes Origination fee and other income Origination Fee And Other Income Origination Fee And Other Income Credit concentration risk Credit Concentration Risk [Member] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Less: Undistributed earnings 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Standalone Commerical Paper Program Tier Three Commercial Paper Program [Member] Tier Three Commercial Paper Program 3 Internal Credit Rating 3 [Member] Internal Credit Rating 3 [Member] Total Debt Securities, Held-to-Maturity, Weighted Average Yield Equity method investee Equity Method Investee [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Maturities by period (excluding allowance) Financing Receivables, Fiscal Year Maturity [Abstract] Financing Receivables, Fiscal Year Maturity [Abstract] Accrued interest Debt Instrument Accrued Interest Debt instrument accrued interest. 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Less than 1 year Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Interest Rate Period One Debt Instrument, Interest Rate Period One [Member] Debt Instrument, Interest Rate Period One Purchases of and investments in receivables ($62 million and $95 million related to equity method investees, respectively) Purchases of and investments in receivables Additional investments made in related party loans Payments to Acquire Finance Receivables Principal Outstanding principal balance Carrying value of Convertible Notes Total minimum maturities Long-Term Debt, Gross Debt Securities Debt Securities [Member] Asset Class [Domain] Asset Class [Domain] Convertible Notes Debt, Policy [Policy Text Block] Compensation Amount Outstanding Recovery Compensation Amount LTIP Market-Based Vesting Units OP LTIP Market-Based Vesting Units [Member] OP LTIP Market-Based Vesting Units [Member] Individual: Individual [Axis] Weighted average common shares outstanding—diluted (in shares) Weighted-average number of common shares — diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Emerging Growth Company Entity Emerging Growth Company Derivative Financial Instruments Derivatives, Policy [Policy Text Block] Year one Financing Receivable, Year One, Originated, Current Fiscal Year Underlying Security Market Price Change Underlying Security Market Price Change, Percent Proceeds from credit facilities Proceeds from Lines of Credit Commercial Paper Commercial Paper [Member] Hannon Armstrong Sustainable Infrastructure Inc. Hannon Armstrong Sustainable Infrastructure Capital, Inc. [Member] Hannon Armstrong Sustainable Infrastructure Capital, Inc. Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instrument Other Than Options Grants In Period Fair Value Share based compensation arrangement by share based payment award equity instrument other than options grants in period fair value. 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Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Approved issuance Commercial Paper, Authorized, Amount Commercial Paper, Authorized, Amount 4.39 - 4.42 Percent Interest rate swap 4.39 - 4.42 Percent Interest Rate Collar [Member] 4.93 - 4.42 Percent Interest Rate Collar State or local governments US States and Political Subdivisions Debt Securities [Member] Income (loss) before equity method investments Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Principal collections from receivables ($124 million and $79 million from equity method investees, respectively) Principal collections from receivables Principal collected from related party loans Proceeds from Collection of Finance Receivables Repayment of outstanding principal and accrued interest Repayments of Long-Term Debt Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Receivables Receivables, Fair Value Disclosure Variable Rate Component Two Variable Rate Component Two [Member] Variable Rate Component Two Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity method investments Equity method investments Carrying Value Equity Method Investments Equity Component [Domain] Equity Component [Domain] Equity method investee losses applied Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Measurement Input Type [Domain] Measurement Input Type [Domain] Adoption Date Trading Arrangement Adoption Date Counterparty Name [Domain] Counterparty Name [Domain] Junior subordinated notes Subordinated Debt Obligations, Fair Value Disclosure Asset Management Arrangement Asset Management Arrangement [Member] Reimbursement percent Guarantor Obligations, Reimbursement, Percent Guarantor Obligations, Reimbursement, Percent Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value [Roll Forward] Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value Total Debt Securities, Held-to-Maturity, Fair Value Interest income from related party loans Interest Income, Operating Other Proceeds from (Payment for) Other Financing Activity Unrealized gain (loss) on available-for-sale securities tax benefit (provision) Other Comprehensive Income (Loss), Available-for-sale Securities And Retained Interests In Securitization Trusts, Gain (Loss), After Reclassification, Tax Other Comprehensive Income (Loss), Available-for-sale Securities And Retained Interests In Securitization Trusts, Gain (Loss), After Reclassification, Tax Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Initial cap price per share (in usd per share) Option Contract Indexed to Equity, Settlement, Share, Fair Value Per Share Cash received from retained interests in securitization trusts and servicing fees Cash Received From Cash received From Retained Interests In Securitization Trusts Cash received from residual and servicing assets. Letter of Credit Letter of Credit [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Construction fixed assets net Construction in Progress, Gross Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Restricted stock units Restricted Stock Units Restricted Stock Units (RSUs) [Member] Exchange of operating partnership units to common stock (in shares) Exchange Of Operating Partnership Units To Common Stock Exchange of operating partnership units to common stock. All Adjustments to Compensation All Adjustments to Compensation [Member] 2026 Senior Notes Senior Unsecured Notes Due June 15, 2026 [Member] Senior Unsecured Notes Due June 15, 2026 Income Taxes Income Tax, Policy [Policy Text Block] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Income Statement [Abstract] Stockholders’ Equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Receivables eliminated upon consolidation of a VIE Noncash or Part Noncash Acquisition, Intercompany Accounts Receivable Eliminated Noncash or Part Noncash Acquisition, Intercompany Accounts Receivable Eliminated Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] City Area Code City Area Code Count of Assets Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Number of Positions [Abstract] Potential shares of common stock related to Convertible Notes Convertible Debt Securities [Member] Non-cash gain on securitization Gains on securitizations Gain (Loss) on Securitization of Financial Assets Collateral received from hedge counterparties Proceeds from Hedge, Investing Activities Term loans payable and non-recourse debt Debt Instrument, Fair Value Disclosure Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Consolidation measurement input Variable Interest Entity, Primary Beneficiary, Measurement Input Variable Interest Entity, Primary Beneficiary, Measurement Input Recourse Status [Domain] Recourse Status 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