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Insurance Regulatory Restrictions Additional Details (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Average Annual Rate Of Return | 5.43% | 5.87% |
Prescribed Discount Rate Percentage | 5.10% |  |
Statutory Accounting Practices, Statutory Capital and Surplus Required | $ 100 |  |
REDUCTION TO GROSS PAID-IN AND CONNTRIBUTED SURPLUS | $ 3,433 |  |
Statutory Accounting Practices, Statutory Capital and Surplus Required Pursuant to AMPS Exchange |  | $ 75 |
Quarterly Dividend Increase Limitation Percentage | 15.00% |  |
Percentage Of Policy Holders Surplus | 10.00% |  |
Minimum [Member] |  |  |
Settlement Agreement Annual Restricted Payment Amount | $ 5 |  |
Maximum [Member] |  |  |
Settlement Agreement Annual Restricted Payment Amount | 8 |  |
Ambac Assurance [Member] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 1,088 | 1,152 |
Ambac Assurance [Member] | Prescribed Or Permitted Additional Accounting Practices [Member] |  |  |
Statutory Accounting Practices, Prescribed Practice, Amount | $ (12) | $ (42) |
5.1 % Surplus Notes Due 2020 [Member] | Ambac Assurance Corporation [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.10% | 5.10%

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