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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Total revenues $ 723 $ 848 $ 1,115
Total expenses 536 465 729
Equity in earnings (losses) of investees (39) 94 27
Provision (Benefit) for Income Taxes 11 58 45
Less: Noncontrolling interests 13 30 6
Total consolidated 124 389 362
Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 869 816 940
Total expenses 378 141 574
Equity in earnings (losses) of investees (51) 144 61
Provision (Benefit) for Income Taxes 33 116 48
Less: Noncontrolling interests 0 0 0
Total consolidated 407 703 379
Operating Segments | Insurance      
Segment Reporting Information [Line Items]      
Total revenues 757 733 874
Total expenses 259 33 446
Equity in earnings (losses) of investees (51) 144 61
Provision (Benefit) for Income Taxes 34 122 60
Less: Noncontrolling interests 0 0 0
Total consolidated 413 722 429
Operating Segments | Asset Management      
Segment Reporting Information [Line Items]      
Total revenues 112 83 66
Total expenses 119 108 128
Equity in earnings (losses) of investees 0 0 0
Provision (Benefit) for Income Taxes (1) (6) (12)
Less: Noncontrolling interests 0 0 0
Total consolidated (6) (19) (50)
Corporate division      
Segment Reporting Information [Line Items]      
Total revenues 4 2 9
Total expenses 143 312 132
Equity in earnings (losses) of investees 0 0 (6)
Provision (Benefit) for Income Taxes (5) (47) (18)
Less: Noncontrolling interests 0 0 0
Total consolidated (134) (263) (111)
Other Operating Segments And Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 14 142 40
Total expenses 19 26 21
Equity in earnings (losses) of investees 12 (50) (28)
Provision (Benefit) for Income Taxes 0 6 (3)
Less: Noncontrolling interests 13 30 6
Total consolidated (6) 30 (12)
Subtotal      
Segment Reporting Information [Line Items]      
Total revenues 887 960 989
Total expenses 540 479 727
Equity in earnings (losses) of investees (39) 94 27
Provision (Benefit) for Income Taxes 28 75 27
Less: Noncontrolling interests 13 30 6
Total consolidated 267 470 256
Segment Reconciling Items | Realized gains (losses) on investments      
Segment Reporting Information [Line Items]      
Total revenues (56) 15 18
Total expenses 0 0 0
Equity in earnings (losses) of investees 0 0 0
Provision (Benefit) for Income Taxes 0 0 0
Less: Noncontrolling interests 0 0 0
Total consolidated (56) 15 18
Segment Reconciling Items | Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives      
Segment Reporting Information [Line Items]      
Total revenues (22) (78) 67
Total expenses (4) (14) 2
Equity in earnings (losses) of investees 0 0 0
Provision (Benefit) for Income Taxes 0 0 0
Less: Noncontrolling interests 0 0 0
Total consolidated (18) (64) 65
Segment Reconciling Items | Fair value gains (losses) on CCS      
Segment Reporting Information [Line Items]      
Total revenues 24 (28) (1)
Total expenses 0 0 0
Equity in earnings (losses) of investees 0 0 0
Provision (Benefit) for Income Taxes 0 0 0
Less: Noncontrolling interests 0 0 0
Total consolidated 24 (28) (1)
Segment Reconciling Items | Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves      
Segment Reporting Information [Line Items]      
Total revenues (110) (21) 42
Total expenses 0 0 0
Equity in earnings (losses) of investees 0 0 0
Provision (Benefit) for Income Taxes 0 0 0
Less: Noncontrolling interests 0 0 0
Total consolidated (110) (21) 42
Segment Reconciling Items | Provision (Benefit) for Income Taxes      
Segment Reporting Information [Line Items]      
Total revenues 0 0 0
Total expenses 0 0 0
Equity in earnings (losses) of investees 0 0 0
Provision (Benefit) for Income Taxes 17 17 (18)
Less: Noncontrolling interests 0 0 0
Total consolidated $ (17) $ (17) $ 18