v3.26.1
Our Portfolio - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 01, 2020
committee_member
Dec. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
equity_investment
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
vote
project
director
GW
Jun. 30, 2025
USD ($)
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Equity method investments, receivables, real estate and investments     $ 8,200,000,000   $ 8,200,000,000        
Allowance   $ 62,000,000 $ 56,000,000   56,000,000        
Equity method investments impaired | equity_investment     3            
Number of impaired investments | equity_investment     2            
Impairment loss     $ 70,000,000            
Provision for loss on receivables     (11,000,000)            
Investments         694,414,000 $ 299,980,000      
Total assets   8,187,965,000 8,940,993,000   8,940,993,000        
Loans   3,280,046,000 3,145,473,000   3,145,473,000        
Equity method investments   4,115,909,000 4,782,318,000   4,782,318,000        
Commercial                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Allowance   62,000,000 56,000,000 $ 55,000,000 56,000,000 55,000,000 $ 67,000,000 $ 54,000,000 $ 50,000,000
Provision for loss on receivables     (11,000,000) $ 1,000,000 (6,000,000) $ 5,000,000      
CarbonCount Holdings 1 LLC | Senior Notes Due 2045                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Principal     1,000,000,000.0   $ 1,000,000,000.0        
Joint Venture                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Services agreement         1.00%        
Joint Venture | CarbonCount Holdings 1 LLC                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Directors | director         4        
Affirmative director vote | vote         3        
Total assets     $ 2,900,000,000   $ 2,900,000,000        
Percent of equity securities     71.00%   71.00%        
Percent of receivables and debt securities     0.29   0.29        
Equity method investee                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Loans   629,000,000 $ 1,000,000,000.0   $ 1,000,000,000.0        
Equity method investments     1,300,000,000   $ 1,300,000,000        
Debt term         10 years        
Equity method investee | Commercial                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Loans     1,000,000,000.0   $ 1,000,000,000.0        
Maximum | Joint Venture                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Management services         1.00%        
Maximum | Joint Venture | CarbonCount Holdings 1 LLC                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Investment         $ 1,500,000,000        
Minimum | Joint Venture                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Management services         0.50%        
Hannon Armstrong Sustainable Infrastructure Inc. | Joint Venture | CarbonCount Holdings 1 LLC                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Directors | director         2        
KKR Entity | Joint Venture | CarbonCount Holdings 1 LLC                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Directors | director         2        
CarbonCount Holdings 1 LLC | Joint Venture                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Investment         $ 900,000,000        
CarbonCount Holdings 1 LLC | Joint Venture | KKR Entity                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Investment   $ 63,000,000     900,000,000        
CarbonCount Holdings 1 LLC | Maximum | Joint Venture                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Investment         1,500,000,000        
CarbonCount Holdings 1 LLC | Maximum | Joint Venture | KKR Entity                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Investment         $ 1,500,000,000        
Jupiter Equity Holdings LLC                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Portfolio of renewable energy projects, power (gigawatts) | GW         2.0        
Capital contribution     562,000,000   $ 562,000,000        
Working capital loan outstanding     74,000,000   74,000,000        
Distribution percent (as a percent) 49.00%                
Review committee | committee_member 4                
Distribution from partnership, upon achievement of certain targets (as a percent) 33.00%                
Equity method investments     499,000,000   $ 499,000,000        
Jupiter Equity Holdings LLC | Sponsor                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Distribution from partnership, upon achievement of certain targets (as a percent) 67.00%                
Jupiter Equity Holdings LLC | Sponsor                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Review committee | committee_member 2                
Jupiter Equity Holdings LLC | Company                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Review committee | committee_member 2                
Jupiter Equity Holdings LLC | Jupiter Equity Holdings LLC | Class A units                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Ownership percent (as a percent) 100.00%                
Jupiter Equity Holdings LLC | Onshore wind projects                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Projects owned | project         8        
Jupiter Equity Holdings LLC | Solar projects                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Projects owned | project         4        
Palmetto HASI Holdings LLC                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Investments         $ 194,000,000        
Equity method investments     $ 421,000,000   $ 421,000,000        
CarbonCount Holdings 1 LLC                  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                  
Ownership percentage     50.00%   50.00%        
Income elimination, percent     50.00%   50.00%        
Equity method investments     $ 970,000,000   $ 970,000,000