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Outstanding Exposure - Financial Guaranty Portfolio by Internal Rating (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items]    
Net $ 233,379 $ 236,392
% of total net par outstanding 100.00% 100.00%
AAA    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,611 $ 3,788
% of total net par outstanding 1.50% 1.60%
AA    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 25,101 $ 25,359
% of total net par outstanding 10.80% 10.70%
A    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 105,781 $ 106,091
% of total net par outstanding 45.30% 44.90%
BBB    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 93,247 $ 93,798
% of total net par outstanding 40.00% 39.70%
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 5,639 $ 7,356
% of total net par outstanding 2.40% 3.10%
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 224,463 $ 227,164
Public finance | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 175,957 $ 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 $ 48,506 $ 49,945
% of total net par outstanding 100.00% 100.00%
Public finance | AAA | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 270 $ 272
% of total net par outstanding 0.20% 0.20%
Public finance | AAA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 2,102 $ 2,217
% of total net par outstanding 4.30% 4.50%
Public finance | AA | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 16,472 $ 16,372
% of total net par outstanding 9.40% 9.20%
Public finance | AA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,975 $ 4,205
% of total net par outstanding 8.20% 8.40%
Public finance | A | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 94,442 $ 94,459
% of total net par outstanding 53.60% 53.30%
Public finance | A | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 10,382 $ 10,659
% of total net par outstanding 21.40% 21.30%
Public finance | BBB | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 61,039 $ 60,744
% of total net par outstanding 34.70% 34.30%
Public finance | BBB | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 31,486 $ 32,264
% of total net par outstanding 64.90% 64.60%
Public finance | BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 4,295 $ 5,972
Public finance | BIG | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 3,734 $ 5,372
% of total net par outstanding 2.10% 3.00%
Public finance | BIG | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 561 $ 600
% of total net par outstanding 1.20% 1.20%
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 8,916 $ 9,228
Structured finance | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 8,101 $ 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 $ 815 $ 854
% of total net par outstanding 100.00% 100.00%
Structured finance | AAA | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 757 $ 806
% of total net par outstanding 9.30% 9.60%
Structured finance | AAA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 482 $ 493
% of total net par outstanding 59.10% 57.70%
Structured finance | AA | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 4,633 $ 4,760
% of total net par outstanding 57.20% 56.80%
Structured finance | AA | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 21 $ 22
% of total net par outstanding 2.70% 2.60%
Structured finance | A | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 801 $ 813
% of total net par outstanding 9.90% 9.70%
Structured finance | A | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 156 $ 160
% of total net par outstanding 19.10% 18.70%
Structured finance | BBB | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 566 $ 611
% of total net par outstanding 7.00% 7.30%
Structured finance | BBB | Non-U.S. public finance    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 156 $ 179
% of total net par outstanding 19.10% 21.00%
Structured finance | BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 1,344 $ 1,384
Structured finance | BIG | UNITED STATES    
Schedule of Insured Financial Obligations [Line Items]    
Net $ 1,344 $ 1,384
% of total net par outstanding 16.60% 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%