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Contracts Accounted for as Insurance - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Guarantor Obligations [Line Items] |  |  |
Weighted average risk-free rates for U.S. dollar denominated financial guaranty insurance obligations | 4.15% | 1.02% |
Net Par Outstanding | $ 233,258 | $ 236,392 |
Gross | 370,172 | 367,770 |
Increase (decrease) in net par due to commutations |  |  | $ 336
Commutation gains (losses) | 2 | 0 | 38
Gross Exposure | 1,700 |  |
Puerto Rico |  |  |
Guarantor Obligations [Line Items] |  |  |
Net Par Outstanding | 1,361 | 3,572 |
Gross | 1,899 | 5,322 |
Net par exposures reassumed |  |  | $ 118
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement |  |  |
Guarantor Obligations [Line Items] |  |  |
Net Par Outstanding | 509 | $ 2,643 |
Puerto Rico | Puerto Rico Exposures Subject to a Plan Support Agreement | HTA/CCDA PSA |  |  |
Guarantor Obligations [Line Items] |  |  |
Outstanding principal amount of amended plan election, net | 451 |  |
Assumed Business |  |  |
Guarantor Obligations [Line Items] |  |  |
Insured financial obligations insured contractual payments outstanding, amount represented | $ 14,000 |  |
Insured financial obligations insured contractual payments outstanding, percentage represented | 3.80% |  |
AGC |  |  |
Guarantor Obligations [Line Items] |  |  |
Amounts could be required to pay if third party exercised right to recapture business | $ 234 |  |
AG Re |  |  |
Guarantor Obligations [Line Items] |  |  |
Amounts could be required to pay if third party exercised right to recapture business | 34 |  |
Ceded Business |  |  |
Guarantor Obligations [Line Items] |  |  |
Insured financial obligations insured contractual payments outstanding, amount represented | $ 221 |  |
Insured financial obligations insured contractual payments outstanding, percentage represented | 0.10% |  |
Gross Insured Specialty and Reinsurance Business |  |  |
Guarantor Obligations [Line Items] |  |  |
Insured financial obligations insured contractual payments outstanding, amount represented | $ 483 |  |
ARGO | Uncollateralized |  |  |
Guarantor Obligations [Line Items] |  |  |
Guaranty liabilities | $ 12 |  |
Minimum |  |  |
Guarantor Obligations [Line Items] |  |  |
Risk free discount rate | 3.82% | 0.00% |
Maximum |  |  |
Guarantor Obligations [Line Items] |  |  |
Risk free discount rate | 4.69% | 1.98% |
Premiums Receivable | Foreign Currency Concentration Risk | Premiums Receivable |  |  |
Guarantor Obligations [Line Items] |  |  |
Percentage of installment premiums denominated in currencies other than the U.S. dollar | 74.00% | 78.00% |

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