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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Revenues | $ 245 | $ 283
Expenses | 125 | 165
Equity in Earnings (Losses) of Investees | 24 | 2
Less: Provision (benefit) for income taxes | 31 | 23
Less: Noncontrolling interests | 4 | 16
Net Income (Loss) Attributable to AGL | 109 | 81
Subtotal |  |
Segment Reporting Information [Line Items] |  |
Revenues | 251 | 268
Expenses | 127 | 165
Equity in Earnings (Losses) of Investees | 24 | 2
Less: Provision (benefit) for income taxes | 31 | 21
Less: Noncontrolling interests | 4 | 16
Net Income (Loss) Attributable to AGL | 113 | 68
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 230 | 231
Expenses | 85 | 121
Equity in Earnings (Losses) of Investees | 41 | 30
Less: Provision (benefit) for income taxes | 36 | 24
Less: Noncontrolling interests | 0 | 0
Net Income (Loss) Attributable to AGL | 150 | 116
Operating Segments | Insurance |  |
Segment Reporting Information [Line Items] |  |
Revenues | 229 | 190
Expenses | 85 | 79
Equity in Earnings (Losses) of Investees | 40 | 30
Less: Provision (benefit) for income taxes | 35 | 24
Less: Noncontrolling interests | 0 | 0
Net Income (Loss) Attributable to AGL | 149 | 117
Operating Segments | Asset Management |  |
Segment Reporting Information [Line Items] |  |
Revenues | 1 | 41
Expenses | 0 | 42
Equity in Earnings (Losses) of Investees | 1 | 0
Less: Provision (benefit) for income taxes | 1 | 0
Less: Noncontrolling interests | 0 | 0
Net Income (Loss) Attributable to AGL | 1 | (1)
Corporate division |  |
Segment Reporting Information [Line Items] |  |
Revenues | 5 | 2
Expenses | 47 | 48
Equity in Earnings (Losses) of Investees | 0 | 0
Less: Provision (benefit) for income taxes | (5) | (2)
Less: Noncontrolling interests | 0 | 0
Net Income (Loss) Attributable to AGL | (37) | (44)
Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | 16 | 35
Expenses | (5) | (4)
Equity in Earnings (Losses) of Investees | (17) | (28)
Less: Provision (benefit) for income taxes | 0 | (1)
Less: Noncontrolling interests | 4 | 16
Net Income (Loss) Attributable to AGL | 0 | (4)
Reconciling items: |  |
Segment Reporting Information [Line Items] |  |
Expenses | (2) |
Reconciling items: | Realized gains (losses) on investments |  |
Segment Reporting Information [Line Items] |  |
Revenues | 8 | (2)
Net Income (Loss) Attributable to AGL | 8 | (2)
Reconciling items: | Non-credit impairment-related unrealized fair value gains (losses) on credit derivatives |  |
Segment Reporting Information [Line Items] |  |
Revenues | 8 | 13
Net Income (Loss) Attributable to AGL | 10 | 13
Reconciling items: | Fair value gains (losses) on CCS |  |
Segment Reporting Information [Line Items] |  |
Revenues | (10) | (16)
Net Income (Loss) Attributable to AGL | (10) | (16)
Reconciling items: | Foreign exchange gains (losses) on remeasurement of premiums receivable and loss and LAE reserves |  |
Segment Reporting Information [Line Items] |  |
Revenues | (12) | 20
Net Income (Loss) Attributable to AGL | $ (12) | 20
Reconciling items: | Tax effect |  |
Segment Reporting Information [Line Items] |  |
Less: Provision (benefit) for income taxes |  | (2)
Net Income (Loss) Attributable to AGL |  | $ 2

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