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Expected Loss to be Paid (Recovered) - Net Expected Loss to be Paid (Recovered) and Net Economic Loss Development (Benefit) by Accounting Model (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |  |  |  |  |
Net Expected Loss to be Paid (Recovered) | $ 447 | $ 560 | $ 447 | $ 560 | $ 433 | $ 505 | $ 517 | $ 522
Net economic loss development (benefit) | 21 | 49 | 14 | 60 |  |  |  |
Insurance |  |  |  |  |  |  |  |
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |  |  |  |  |
Net Expected Loss to be Paid (Recovered) | 203 |  | 203 |  |  | 263 |  |
Net economic loss development (benefit) | 19 | 62 | 12 | 68 |  |  |  |
FG VIEs' assets |  |  |  |  |  |  |  |
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |  |  |  |  |
Net Expected Loss to be Paid (Recovered) | 242 |  | 242 |  |  | 240 |  |
Net economic loss development (benefit) | 1 | (14) | 1 | (9) |  |  |  |
Credit derivatives |  |  |  |  |  |  |  |
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |  |  |  |  |
Net Expected Loss to be Paid (Recovered) | 2 |  | 2 |  |  | $ 2 |  |
Net economic loss development (benefit) | $ 1 | $ 1 | $ 1 | $ 1 |  |  |  |

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