v3.25.4
Debt - Narrative (Details)
3 Months Ended 12 Months Ended
Sep. 12, 2025
USD ($)
Jun. 27, 2025
USD ($)
Jun. 30, 2023
USD ($)
extension
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Nov. 07, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 02, 2025
USD ($)
Aug. 12, 2025
USD ($)
Nov. 21, 2024
USD ($)
Debt Instrument [Line Items]                        
Principal and accrued interest         $ 4,644,000,000 $ 5,259,000,000 $ 3,780,000,000          
Debt         13,364,000,000 10,588,000,000            
Asset Management                        
Debt Instrument [Line Items]                        
Debt         5,516,000,000 4,279,000,000            
Retirement Services                        
Debt Instrument [Line Items]                        
Debt         $ 7,848,000,000 $ 6,309,000,000            
Senior Secured Notes | Asset Management                        
Debt Instrument [Line Items]                        
Principal and accrued interest $ 375,000,000                      
Debt                 $ 0      
Senior Secured Notes | Retirement Services                        
Debt Instrument [Line Items]                        
Debt instrument, redemption price (as percent)         100.00%              
5.15% 2035 Senior Notes | Senior Secured Notes | Asset Management                        
Debt Instrument [Line Items]                        
Aggregate principal amount               $ 350,000,000     $ 500,000,000  
Interest rate (as percent)         5.15% 5.15%         5.15%  
Debt         $ 839,000,000 $ 0            
Senior Notes Due 2031 | Senior Secured Notes | Asset Management                        
Debt Instrument [Line Items]                        
Aggregate principal amount               $ 400,000,000        
Interest rate (as percent)               4.60%        
2055 AHL Senior Notes | Senior Secured Notes | Retirement Services                        
Debt Instrument [Line Items]                        
Aggregate principal amount       $ 1,000,000,000.0                
Interest rate (as percent)       6.625% 6.63% 6.63%            
Debt         $ 979,000,000 $ 0            
7.25% 2064 Subordinated Notes | Subordinated Notes | Retirement Services                        
Debt Instrument [Line Items]                        
Interest rate (as percent)         7.25% 7.25%            
Debt         $ 558,000,000 $ 558,000,000            
Debt instrument, deferred interest payment, period (in years)         5 years              
2055 AHL Subordinated Notes | Subordinated Notes | Retirement Services                        
Debt Instrument [Line Items]                        
Aggregate principal amount       $ 600,000,000                
Interest rate (as percent)       6.875% 6.88% 6.88%            
Debt         $ 592,000,000 $ 0            
Debt instrument, deferred interest payment, period (in years)       5 years                
Basis spread on variable rate (as percent)       2.582%                
AGM Credit Facility | Line of Credit | Asset Management | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity         1,250,000,000             $ 1,250,000,000
Amount outstanding         0 0            
Line of credit facility, maximum borrowing capacity including potential increases         1,500,000,000              
AMH Credit Facility | Line of Credit | Asset Management | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Incremental facilities, maximum amount         $ 250,000,000              
Maximum leverage ratio         4.00              
Bridge Credit Facility | Line of Credit | Asset Management | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity                   $ 150,000,000    
Amount outstanding         $ 0              
Increase in aggregate commitments                   $ 75,000,000    
AHL Credit Facility | Line of Credit | Retirement Services | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity     $ 1,250,000,000   1,250,000,000              
Amount outstanding         0 0            
Debt instrument, term (in years)     5 years                  
Number of extensions | extension     2                  
Renewal term of credit facility (in years)     1 year                  
Line of credit facility, maximum borrowing capacity including potential increases     $ 1,750,000,000   1,750,000,000              
Capitalization ratio (as percent)     35.00%                  
Minimum consolidated net worth     $ 14,800,000,000                  
AHL Liquidity Facility | Line of Credit | Retirement Services | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity   $ 2,600,000,000     2,600,000,000              
Amount outstanding         0 $ 0            
Renewal term of credit facility (in years)   364 days                    
Conversion term (in years)   1 year                    
Line of credit facility, maximum borrowing capacity including potential increases   $ 3,100,000,000     $ 3,100,000,000              
Minimum consolidated net worth   $ 23,200,000,000