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Outstanding Exposure - Financial Guaranty Portfolio by Internal Rating (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Insured Financial Obligations [Line Items]    
Net $ 274,875 $ 261,552
% of total net par outstanding 100.00% 100.00%
AAA    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 2,884 $ 3,081
% of total net par outstanding 1.00% 1.20%
AA    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 25,305 $ 25,962
% of total net par outstanding 9.30% 9.90%
A    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 137,206 $ 127,617
% of total net par outstanding 49.90% 48.80%
BBB    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 98,102 $ 94,710
% of total net par outstanding 35.70% 36.20%
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 11,378 $ 10,182
% of total net par outstanding 4.10% 3.90%
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 263,418 $ 250,375
Public finance | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 212,091 $ 201,175
% of total net par outstanding 100.00% 100.00%
Public finance | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 51,327 $ 49,200
% of total net par outstanding 100.00% 100.00%
Public finance | AAA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 22 $ 25
% of total net par outstanding 0.00% 0.00%
Public finance | AAA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 1,873 $ 2,074
% of total net par outstanding 3.70% 4.20%
Public finance | AA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 17,346 $ 17,664
% of total net par outstanding 8.20% 8.80%
Public finance | AA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 2,522 $ 2,854
% of total net par outstanding 4.90% 5.80%
Public finance | A | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 121,320 $ 111,502
% of total net par outstanding 57.20% 55.50%
Public finance | A | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 12,422 $ 13,046
% of total net par outstanding 24.20% 26.50%
Public finance | BBB | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 69,807 $ 69,096
% of total net par outstanding 32.90% 34.30%
Public finance | BBB | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 27,581 $ 24,828
% of total net par outstanding 53.70% 50.50%
Public finance | BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 10,525 $ 9,286
Public finance | BIG | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,596 $ 2,888
% of total net par outstanding 1.70% 1.40%
Public finance | BIG | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 6,929 $ 6,398
% of total net par outstanding 13.50% 13.00%
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 11,457 $ 11,177
Structured finance | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 8,102 $ 8,453
% of total net par outstanding 100.00% 100.00%
Structured finance | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,355 $ 2,724
% of total net par outstanding 100.00% 100.00%
Structured finance | AAA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 474 $ 512
% of total net par outstanding 5.80% 6.10%
Structured finance | AAA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 515 $ 470
% of total net par outstanding 15.40% 17.30%
Structured finance | AA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 5,303 $ 5,386
% of total net par outstanding 65.50% 63.70%
Structured finance | AA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 134 $ 58
% of total net par outstanding 4.00% 2.10%
Structured finance | A | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 766 $ 952
% of total net par outstanding 9.50% 11.30%
Structured finance | A | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 2,698 $ 2,117
% of total net par outstanding 80.40% 77.70%
Structured finance | BBB | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 706 $ 707
% of total net par outstanding 8.70% 8.30%
Structured finance | BBB | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 8 $ 79
% of total net par outstanding 0.20% 2.90%
Structured finance | BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 853 $ 896
Structured finance | BIG | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 853 $ 896
% of total net par outstanding 10.50% 10.60%
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%