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Outstanding Exposure - Financial Guaranty Portfolio by Internal Rating (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 232,812 | $ 236,392
% of total net par outstanding | 100.00% | 100.00%
AAA |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 3,557 | $ 3,788
% of total net par outstanding | 1.50% | 1.60%
AA |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 25,279 | $ 25,359
% of total net par outstanding | 10.90% | 10.70%
A |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 107,560 | $ 106,091
% of total net par outstanding | 46.20% | 44.90%
BBB |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 91,030 | $ 93,798
% of total net par outstanding | 39.10% | 39.70%
BIG |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 5,386 | $ 7,356
% of total net par outstanding | 2.30% | 3.10%
Public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 224,095 | $ 227,164
Public finance | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 179,648 | $ 177,219
% of total net par outstanding | 100.00% | 100.00%
Public finance | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 44,447 | $ 49,945
% of total net par outstanding | 100.00% | 100.00%
Public finance | AAA | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 260 | $ 272
% of total net par outstanding | 0.10% | 0.20%
Public finance | AAA | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 2,016 | $ 2,217
% of total net par outstanding | 4.40% | 4.50%
Public finance | AA | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 17,042 | $ 16,372
% of total net par outstanding | 9.50% | 9.20%
Public finance | AA | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 3,671 | $ 4,205
% of total net par outstanding | 8.30% | 8.40%
Public finance | A | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 96,931 | $ 94,459
% of total net par outstanding | 54.00% | 53.30%
Public finance | A | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 9,633 | $ 10,659
% of total net par outstanding | 21.70% | 21.30%
Public finance | BBB | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 61,845 | $ 60,744
% of total net par outstanding | 34.40% | 34.30%
Public finance | BBB | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 28,606 | $ 32,264
% of total net par outstanding | 64.40% | 64.60%
Public finance | BIG |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 4,091 | $ 5,972
Public finance | BIG | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 3,570 | $ 5,372
% of total net par outstanding | 2.00% | 3.00%
Public finance | BIG | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 521 | $ 600
% of total net par outstanding | 1.20% | 1.20%
Structured finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 8,717 | $ 9,228
Structured finance | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 7,935 | $ 8,374
% of total net par outstanding | 100.00% | 100.00%
Structured finance | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 782 | $ 854
% of total net par outstanding | 100.00% | 100.00%
Structured finance | AAA | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 824 | $ 806
% of total net par outstanding | 10.40% | 9.60%
Structured finance | AAA | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 457 | $ 493
% of total net par outstanding | 58.50% | 57.70%
Structured finance | AA | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 4,554 | $ 4,760
% of total net par outstanding | 57.40% | 56.80%
Structured finance | AA | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 12 | $ 22
% of total net par outstanding | 1.50% | 2.60%
Structured finance | A | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 813 | $ 813
% of total net par outstanding | 10.20% | 9.70%
Structured finance | A | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 183 | $ 160
% of total net par outstanding | 23.40% | 18.70%
Structured finance | BBB | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 449 | $ 611
% of total net par outstanding | 5.70% | 7.30%
Structured finance | BBB | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 130 | $ 179
% of total net par outstanding | 16.60% | 21.00%
Structured finance | BIG |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 1,295 | $ 1,384
Structured finance | BIG | United States |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 1,295 | $ 1,384
% of total net par outstanding | 16.30% | 16.60%
Structured finance | BIG | Non-U.S. public finance |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net | $ 0 | $ 0
% of total net par outstanding | 0.00% | 0.00%

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