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Outstanding Exposure - Financial Guaranty Portfolio by Internal Rating (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 233,258	$ 236,392
% of total net par outstanding	100.00%	100.00%
AAA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 3,584	$ 3,788
% of total net par outstanding	1.50%	1.60%
AA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 24,383	$ 25,359
% of total net par outstanding	10.50%	10.70%
A
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 107,493	$ 106,091
% of total net par outstanding	46.10%	44.90%
BBB
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 91,906	$ 93,798
% of total net par outstanding	39.40%	39.70%
BIG
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 5,892	$ 7,356
% of total net par outstanding	2.50%	3.10%
U.S.
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 187,864
Non U.S.
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	45,394
Public finance
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	224,099	$ 227,164
Public finance | BIG
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	4,777	5,972
Public finance | U.S.
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 179,636	$ 177,219
% of total net par outstanding	100.00%	100.00%
Public finance | U.S. | AAA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 222	$ 272
% of total net par outstanding	0.10%	0.20%
Public finance | U.S. | AA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 16,241	$ 16,372
% of total net par outstanding	9.10%	9.20%
Public finance | U.S. | A
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 96,807	$ 94,459
% of total net par outstanding	53.90%	53.30%
Public finance | U.S. | BBB
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 62,570	$ 60,744
% of total net par outstanding	34.80%	34.30%
Public finance | U.S. | BIG
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 3,796	$ 5,372
% of total net par outstanding	2.10%	3.00%
Public finance | Non U.S.
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 44,463	$ 49,945
% of total net par outstanding	100.00%	100.00%
Public finance | Non U.S. | AAA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 1,967	$ 2,217
% of total net par outstanding	4.40%	4.50%
Public finance | Non U.S. | AA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 3,497	$ 4,205
% of total net par outstanding	7.90%	8.40%
Public finance | Non U.S. | A
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 9,271	$ 10,659
% of total net par outstanding	20.90%	21.30%
Public finance | Non U.S. | BBB
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 28,747	$ 32,264
% of total net par outstanding	64.60%	64.60%
Public finance | Non U.S. | BIG
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 981	$ 600
% of total net par outstanding	2.20%	1.20%
Structured finance
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 9,159	$ 9,228
Structured finance | BIG
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	1,115	1,384
Structured finance | U.S.
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 8,228	$ 8,374
% of total net par outstanding	100.00%	100.00%
Structured finance | U.S. | AAA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 926	$ 806
% of total net par outstanding	11.20%	9.60%
Structured finance | U.S. | AA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 4,633	$ 4,760
% of total net par outstanding	56.30%	56.80%
Structured finance | U.S. | A
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 1,075	$ 813
% of total net par outstanding	13.10%	9.70%
Structured finance | U.S. | BBB
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 479	$ 611
% of total net par outstanding	5.80%	7.30%
Structured finance | U.S. | BIG
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 1,115	$ 1,384
% of total net par outstanding	13.60%	16.60%
Structured finance | Non U.S.
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 931	$ 854
% of total net par outstanding	100.00%	100.00%
Structured finance | Non U.S. | AAA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 469	$ 493
% of total net par outstanding	50.40%	57.70%
Structured finance | Non U.S. | AA
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 12	$ 22
% of total net par outstanding	1.30%	2.60%
Structured finance | Non U.S. | A
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 340	$ 160
% of total net par outstanding	36.50%	18.70%
Structured finance | Non U.S. | BBB
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 110	$ 179
% of total net par outstanding	11.80%	21.00%
Structured finance | Non U.S. | BIG
Schedule of Insured Financial Obligations [Line Items]
Net Par Outstanding	$ 0	$ 0
% of total net par outstanding	0.00%	0.00%

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