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Segment Information - Reconciliation of Net Income (Loss) Attributable to AGL to Segment Adjusted Operating Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenues $ 207 $ 269 $ 833 $ 716
Expenses 92 67 412 305
Equity in Earnings (Losses) of Investees 20 18 76 47
Less: Provision (benefit) for income taxes 21 44 92 88
Less: Noncontrolling interests 9 5 21 12
Net Income (Loss) Attributable to AGL 105 171 384 358
Subtotal        
Segment Reporting Information [Line Items]        
Revenues       673
Expenses       305
Equity in Earnings (Losses) of Investees       47
Less: Provision (benefit) for income taxes       80
Less: Noncontrolling interests       12
Net Income (Loss) Attributable to AGL       323
Realized gains (losses) on investments        
Segment Reporting Information [Line Items]        
Revenues (10) 0 (32) 2
Net Income (Loss) Attributable to AGL (10) 0 (32) 2
Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives        
Segment Reporting Information [Line Items]        
Revenues 1   61 11
Net Income (Loss) Attributable to AGL 1 (2) (2) 11
Fair value gains (losses) on CCS        
Segment Reporting Information [Line Items]        
Revenues 8 (3) 9 (12)
Net Income (Loss) Attributable to AGL 8 (3) 9 (12)
Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves        
Segment Reporting Information [Line Items]        
Revenues (22) 54 82 42
Net Income (Loss) Attributable to AGL (22) 54 82 42
Tax effect        
Segment Reporting Information [Line Items]        
Less: Provision (benefit) for income taxes (4) 8 9 8
Net Income (Loss) Attributable to AGL 4 (8) (9) (8)
Subtotal        
Segment Reporting Information [Line Items]        
Revenues 230 218 713  
Expenses 92 65 349  
Equity in Earnings (Losses) of Investees 20 18 76  
Less: Provision (benefit) for income taxes 25 36 83  
Less: Noncontrolling interests 9 5 21  
Net Income (Loss) Attributable to AGL 124 130 336  
Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 214 206 673 632
Expenses 55 30 237 189
Equity in Earnings (Losses) of Investees 16 32 60 85
Less: Provision (benefit) for income taxes 27 42 88 96
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL 148 166 408 432
Operating Segments | Insurance        
Segment Reporting Information [Line Items]        
Revenues 206 204 644 622
Expenses 51 28 220 183
Equity in Earnings (Losses) of Investees 16 28 48 83
Less: Provision (benefit) for income taxes 26 42 83 95
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL 145 162 389 427
Operating Segments | Asset Management        
Segment Reporting Information [Line Items]        
Revenues 8 2 29 10
Expenses 4 2 17 6
Equity in Earnings (Losses) of Investees 0 4 12 2
Less: Provision (benefit) for income taxes 1 0 5 1
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL 3 4 19 5
Corporate division        
Segment Reporting Information [Line Items]        
Revenues 3 4 11 13
Expenses 38 37 117 128
Equity in Earnings (Losses) of Investees 9 0 28 0
Less: Provision (benefit) for income taxes (2) (4) (5) (14)
Less: Noncontrolling interests 0 0 0 0
Net Income (Loss) Attributable to AGL (24) (29) (73) (101)
Reconciling items:        
Segment Reporting Information [Line Items]        
Expenses   2 63  
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues 13 8 29 28
Expenses (1) (2) (5) (12)
Equity in Earnings (Losses) of Investees (5) (14) (12) (38)
Less: Provision (benefit) for income taxes 0 (2) 0 (2)
Less: Noncontrolling interests 9 5 21 12
Net Income (Loss) Attributable to AGL 0 (7) 1 (8)
Intersegment Eliminations | Insurance        
Segment Reporting Information [Line Items]        
Revenues 2 2 7 7
Intersegment Eliminations | Asset Management        
Segment Reporting Information [Line Items]        
Revenues $ 2 $ 1 $ 5 $ 2