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Background and Business Description - Redemption of Notes - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 15, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net realized gains on extinguishment of debt |  | $ 81 | $ 33 | $ 0
5.1% Surplus Notes, General Account, Due 2020 [Member] |  |  |  |
Net realized gains on extinguishment of debt |  | (134) |  |
Subsequent Event |  |  |  |
Remaining Cash Required For Repayment of Tier 2 Notes | $ 6 |  |  |
Nomura Credit & Capital, Inc. |  |  |  |
Proceeds from Legal Settlements |  | 140 |  |
Nomura Credit & Capital, Inc. | Subsequent Event |  |  |  |
Proceeds from Legal Settlements | 140 |  |  |
Sitka AAC Note | Ambac Assurance Corporation [Member] |  |  |  |
Repayments of Long-term Debt |  | $ 1,218 |  |
Long-term Debt, Repayment, Premium Paid on Principal |  | 103.00% |  |
Net realized gains on extinguishment of debt |  | $ 53 |  |
Portion of Gain (Loss) on Extinguishment of Debt Attributable to AACs Ownership of Sitka Notes |  | 5 |  |
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member] |  |  |  |
Repayments of Long-term Debt |  | $ 213 |  |
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member] | Subsequent Event |  |  |  |
Repayments of Long-term Debt | $ 146 |  |  |

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