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Outstanding Exposure - Financial Guaranty Portfolio by Internal Rating (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule of Insured Financial Obligations [Line Items]    
Net $ 258,196 $ 249,153
% of total net par outstanding 100.00% 100.00%
AAA    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,286 $ 3,504
% of total net par outstanding 1.30% 1.40%
AA    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 26,545 $ 25,868
% of total net par outstanding 10.30% 10.40%
A    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 123,011 $ 118,123
% of total net par outstanding 47.60% 47.40%
BBB    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 94,704 $ 96,221
% of total net par outstanding 36.70% 38.60%
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 10,650 $ 5,437
% of total net par outstanding 4.10% 2.20%
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 247,920 $ 239,296
Public finance | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 195,837 $ 190,289
% of total net par outstanding 100.00% 100.00%
Public finance | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 52,083 $ 49,007
% of total net par outstanding 100.00% 100.00%
Public finance | AAA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 26 $ 110
% of total net par outstanding 0.00% 0.10%
Public finance | AAA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 2,143 $ 2,062
% of total net par outstanding 4.10% 4.20%
Public finance | AA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 17,823 $ 17,883
% of total net par outstanding 9.10% 9.40%
Public finance | AA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,010 $ 3,379
% of total net par outstanding 5.80% 6.90%
Public finance | A | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 107,205 $ 102,945
% of total net par outstanding 54.70% 54.10%
Public finance | A | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 13,961 $ 12,968
% of total net par outstanding 26.80% 26.50%
Public finance | BBB | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 67,651 $ 66,080
% of total net par outstanding 34.60% 34.70%
Public finance | BBB | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 26,362 $ 29,467
% of total net par outstanding 50.60% 60.10%
Public finance | BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 9,739 $ 4,402
Public finance | BIG | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,132 $ 3,271
% of total net par outstanding 1.60% 1.70%
Public finance | BIG | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 6,607 $ 1,131
% of total net par outstanding 12.70% 2.30%
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 10,276 $ 9,857
Structured finance | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 8,717 $ 8,632
% of total net par outstanding 100.00% 100.00%
Structured finance | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 1,559 $ 1,225
% of total net par outstanding 100.00% 100.00%
Structured finance | AAA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 657 $ 867
% of total net par outstanding 7.50% 10.00%
Structured finance | AAA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 460 $ 465
% of total net par outstanding 29.50% 38.00%
Structured finance | AA | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 5,602 $ 4,517
% of total net par outstanding 64.30% 52.30%
Structured finance | AA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 110 $ 89
% of total net par outstanding 7.10% 7.30%
Structured finance | A | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 945 $ 1,639
% of total net par outstanding 10.80% 19.00%
Structured finance | A | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 900 $ 571
% of total net par outstanding 57.70% 46.60%
Structured finance | BBB | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 602 $ 574
% of total net par outstanding 6.90% 6.70%
Structured finance | BBB | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 89 $ 100
% of total net par outstanding 5.70% 8.10%
Structured finance | BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 911 $ 1,035
Structured finance | BIG | United States    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 911 $ 1,035
% of total net par outstanding 10.50% 12.00%
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%