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Commitments and Contingencies - Narrative (Details) - LBIE vs. AG Financial Products $ in Millions | Jul. 01, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 15, 2013 Transaction | Nov. 28, 2011 USD ($) Transaction
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Pending Litigation |  |  |  |  |  |
Commitments and Contingencies Legal Proceedings |  |  |  |  |  |
Amount awarded from other party |  | $ 54 |  |  |  |
Amount awarded from other party, annual interest rate |  | 8.00% |  |  |  |
Damages sought | $ 58 |  |  |  |  |
AG Financial Products Inc. | Guarantee Obligations |  |  |  |  |  |
Commitments and Contingencies Legal Proceedings |  |  |  |  |  |
Number of credit derivative transactions for which termination payment is alleged to be improperly calculated | Transaction |  |  |  |  | 9 | 9
AG Financial Products Inc. | Positive Outcome of Litigation | Pending Litigation |  |  |  |  |  |
Commitments and Contingencies Legal Proceedings |  |  |  |  |  |
Termination payments which LBIE owes to AG Financial Products as per calculation of AG Financial Products |  |  |  |  |  | $ 4
Other credit derivative transactions which LBIE owes to AG Financial Products as per calculation of AG financial products |  |  |  |  |  | $ 21
Loss contingency accrual |  |  | $ 0 | $ 20 |  |
Lehman Brothers International (Europe) |  |  |  |  |  |
Commitments and Contingencies Legal Proceedings |  |  |  |  |  |
Gain contingency, number of credit derivative transactions with improperly calculated payments | Transaction |  |  |  |  |  | 28
Lehman Brothers International (Europe) | Positive Outcome of Litigation | Pending Litigation |  |  |  |  |  |
Commitments and Contingencies Legal Proceedings |  |  |  |  |  |
Termination payments which AG Financial Products owes to LBIE as per calculation of LBIE |  |  |  |  |  | $ 1,400

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