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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 | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |
Net Expected Loss to be Paid (Recovered) | $ 505 | $ 522 | $ 411 | $ 529
Net Economic Loss Development (Benefit) | 164 | (125) | (287) |
Insurance Contracts |  |  |  |
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |
Net Expected Loss to be Paid (Recovered) | 263 | 205 |  |
Net Economic Loss Development (Benefit) | 174 | (112) | (281) |
Financial Guarantee Variable Interest Entities |  |  |  |
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |
Net Expected Loss to be Paid (Recovered) | 240 | 314 |  |
Net Economic Loss Development (Benefit) | (11) | (17) | (20) |
Financial Guarantee Accounted for as Credit Derivatives |  |  |  |
Schedule of Expected Losses to be Paid [Line Items] |  |  |  |
Net Expected Loss to be Paid (Recovered) | 2 | 3 |  |
Net Economic Loss Development (Benefit) | $ 1 | $ 4 | $ 14 |

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