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Segment Information - Reconciliation of Net Income (Loss) Attributable to AGL to Segment Adjusted Operating Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Total revenues $ 1,373 $ 723 $ 848
Total expenses 733 536 465
Equity in earnings (losses) of investees 28 (39) 94
Less: Segment provision (benefit) for income taxes (93) 11 58
Less: Noncontrolling interests 22 13 30
Total consolidated 739 124 389
Bermuda ETA (189) 0 0
Subtotal      
Segment Reporting Information [Line Items]      
Total revenues 1,267 887 960
Total expenses 735 540 479
Equity in earnings (losses) of investees 28 (39) 94
Less: Segment provision (benefit) for income taxes (110) 28 75
Less: Noncontrolling interests 22 13 30
Total consolidated 648 267 470
Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 931 869 816
Total expenses 513 378 141
Equity in earnings (losses) of investees 87 (51) 144
Less: Segment provision (benefit) for income taxes (119) 33 116
Less: Noncontrolling interests 0 0 0
Total consolidated 624 407 703
Operating Segments | Insurance      
Segment Reporting Information [Line Items]      
Total revenues 855 757 733
Total expenses 435 259 33
Equity in earnings (losses) of investees 82 (51) 144
Less: Segment provision (benefit) for income taxes (119) 34 122
Less: Noncontrolling interests 0 0 0
Total consolidated 621 413 722
Operating Segments | Asset Management      
Segment Reporting Information [Line Items]      
Total revenues 76 112 83
Total expenses 78 119 108
Equity in earnings (losses) of investees 5 0 0
Less: Segment provision (benefit) for income taxes 0 (1) (6)
Less: Noncontrolling interests 0 0 0
Total consolidated 3 (6) (19)
Corporate division      
Segment Reporting Information [Line Items]      
Total revenues 275 4 2
Total expenses 216 143 312
Equity in earnings (losses) of investees 0 0 0
Less: Segment provision (benefit) for income taxes 14 (5) (47)
Less: Noncontrolling interests 0 0 0
Total consolidated 45 (134) (263)
Other Operating Segments And Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 61 14 142
Total expenses 6 19 26
Equity in earnings (losses) of investees (59) 12 (50)
Less: Segment provision (benefit) for income taxes (5) 0 6
Less: Noncontrolling interests 22 13 30
Total consolidated (21) (6) 30
Segment Reconciling Items      
Segment Reporting Information [Line Items]      
Total expenses   (4) (14)
Segment Reconciling Items | Realized gains (losses) on investments      
Segment Reporting Information [Line Items]      
Total revenues (14) (56) 15
Total consolidated (14) (56) 15
Segment Reconciling Items | Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives      
Segment Reporting Information [Line Items]      
Total revenues 104 (22) (78)
Total expenses (2)    
Total consolidated 106 (18) (64)
Segment Reconciling Items | Fair value gains (losses) on CCS      
Segment Reporting Information [Line Items]      
Total revenues (35) 24 (28)
Total consolidated (35) 24 (28)
Segment Reconciling Items | Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves      
Segment Reporting Information [Line Items]      
Total revenues 51 (110) (21)
Total consolidated 51 (110) (21)
Segment Reconciling Items | Provision (Benefit) for Income Taxes (1)      
Segment Reporting Information [Line Items]      
Less: Segment provision (benefit) for income taxes (17) 17 17
Total consolidated $ (17) $ 17 $ 17