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Outstanding Insurance Exposure - Financial Guaranty Portfolio by Asset Class (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Schedule of Insured Financial Obligations [Line Items]    
Total gross par outstanding $ 234,571 $ 238,156
Total net par outstanding 234,153 236,807
Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 224,625 226,746
Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 9,528 10,061
U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 180,549  
U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Total gross par outstanding 171,838 176,047
Total net par outstanding 171,597 175,487
U.S. | Public finance | General obligation    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 72,268 73,467
U.S. | Public finance | Tax backed    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 34,800 37,047
U.S. | Public finance | Municipal utilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 25,275 26,195
U.S. | Public finance | Transportation    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 15,179 16,209
U.S. | Public finance | Healthcare    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 8,691 7,148
U.S. | Public finance | Higher education    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 6,127 5,916
U.S. | Public finance | Infrastructure finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 5,843 5,429
U.S. | Public finance | Housing revenue    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,149 1,321
U.S. | Public finance | Investor-owned utilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 644 655
U.S. | Public finance | Renewable energy    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 204 210
U.S. | Public finance | Other    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,417 1,890
U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Total gross par outstanding 8,977 9,800
Total net par outstanding 8,952 9,300
U.S. | Structured finance | Other    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 600 596
U.S. | Structured finance | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 2,990 3,546
U.S. | Structured finance | Life insurance transactions    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 2,581 1,776
U.S. | Structured finance | Pooled corporate obligations    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,193 1,401
U.S. | Structured finance | Financial products    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 820 1,019
U.S. | Structured finance | Consumer receivables    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 768 962
Non U.S.    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 53,604  
Non U.S. | Public finance    
Schedule of Insured Financial Obligations [Line Items]    
Total gross par outstanding 53,175 51,538
Total net par outstanding 53,028 51,259
Non U.S. | Public finance | Infrastructure finance    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 17,819 17,952
Non U.S. | Public finance | Renewable energy    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 2,708 1,555
Non U.S. | Public finance | Regulated utilities    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 19,370 18,995
Non U.S. | Public finance | Sovereign and sub-sovereign    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 11,682 11,341
Non U.S. | Public finance | Pooled infrastructure    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 1,449 1,416
Non U.S. | Structured finance    
Schedule of Insured Financial Obligations [Line Items]    
Total gross par outstanding 581 771
Total net par outstanding 576 761
Non U.S. | Structured finance | Other    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 219 279
Non U.S. | Structured finance | RMBS    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding 357 427
Non U.S. | Structured finance | Pooled corporate obligations    
Schedule of Insured Financial Obligations [Line Items]    
Total net par outstanding $ 0 $ 55