v3.25.2
Segment Information - Reconciliation of Net Income (Loss) Attributable to AGL to Segment Adjusted Operating Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Revenues $ 281 $ 202 $ 626 $ 447
Expenses 151 113 320 238
Equity in Earnings (Losses) of Investees 3 5 56 29
Less: Provision (benefit) for income taxes 27 13 71 44
Less: Noncontrolling interests 3 3 12 7
Net Income (Loss) Attributable to AGL 103 78 279 187
Subtotal        
Segment Reporting Information [Line Items]        
Revenues       455
Expenses       240
Equity in Earnings (Losses) of Investees       29
Less: Provision (benefit) for income taxes       44
Less: Noncontrolling interests       7
Net Income (Loss) Attributable to AGL       193
Realized gains (losses) on investments        
Segment Reporting Information [Line Items]        
Revenues (6) (6) (22) 2
Net Income (Loss) Attributable to AGL (6) (6) (22) 2
Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives        
Segment Reporting Information [Line Items]        
Revenues (1) 3 60 11
Net Income (Loss) Attributable to AGL (1) 3 (3) 13
Fair value gains (losses) on CCS        
Segment Reporting Information [Line Items]        
Revenues (1) 1 1 (9)
Net Income (Loss) Attributable to AGL (1) 1 1 (9)
Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves        
Segment Reporting Information [Line Items]        
Revenues 71   104 (12)
Net Income (Loss) Attributable to AGL 71   104 (12)
Tax effect        
Segment Reporting Information [Line Items]        
Less: Provision (benefit) for income taxes 10   13  
Net Income (Loss) Attributable to AGL (10)   (13)  
Subtotal        
Segment Reporting Information [Line Items]        
Revenues 218 204 483  
Expenses 151 113 257  
Equity in Earnings (Losses) of Investees 3 5 56  
Less: Provision (benefit) for income taxes 17 13 58  
Less: Noncontrolling interests 3 3 12  
Net Income (Loss) Attributable to AGL 50 80 212  
Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 214 196 459 426
Expenses 114 74 182 159
Equity in Earnings (Losses) of Investees 1 12 44 53
Less: Provision (benefit) for income taxes 21 18 61 54
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL 80 116 260 266
Operating Segments | Insurance        
Segment Reporting Information [Line Items]        
Revenues 199 189 438 418
Expenses 105 70 169 155
Equity in Earnings (Losses) of Investees 2 15 32 55
Less: Provision (benefit) for income taxes 20 18 57 53
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL 76 116 244 265
Operating Segments | Asset Management        
Segment Reporting Information [Line Items]        
Revenues 15 7 21 8
Expenses 9 4 13 4
Equity in Earnings (Losses) of Investees (1) (3) 12 (2)
Less: Provision (benefit) for income taxes 1 0 4 1
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL 4 0 16 1
Corporate division        
Segment Reporting Information [Line Items]        
Revenues 4 4 8 9
Expenses 39 44 79 91
Equity in Earnings (Losses) of Investees 3 0 19 0
Less: Provision (benefit) for income taxes (3) (5) (3) (10)
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL (29) (35) (49) (72)
Reconciling items:        
Segment Reporting Information [Line Items]        
Expenses     63 (2)
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues 0 4 16 20
Expenses (2) (5) (4) (10)
Equity in Earnings (Losses) of Investees (1) (7) (7) (24)
Less: Provision (benefit) for income taxes (1) 0 0 0
Less: Noncontrolling interests 3 3 12 7
Net Income (Loss) Attributable to AGL (1) (1) 1 (1)
Intersegment Eliminations | Insurance        
Segment Reporting Information [Line Items]        
Revenues 3 3 5 5
Intersegment Eliminations | Asset Management        
Segment Reporting Information [Line Items]        
Revenues $ 2 $ 1 $ 3 $ 1