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Outstanding Exposure - BIG Net Par Outstanding (Details)
$ in Millions
Jun. 30, 2021
USD ($)
risk
rISK
Dec. 31, 2020
USD ($)
risk
rISK
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding, Credit Derivative $ 4,901 $ 5,371
Total 234,736 234,153
BIG    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding, Financial Guaranty Insurance 7,541 7,855
Net Par Outstanding, Credit Derivative 108 120
Total $ 7,649 $ 7,975
Number of Risks, Financial Guaranty Insurance | risk 259 270
Number of Risks, Credit Derivative | rISK 12 14
Number of Risks | rISK 271 284
BIG | BIG 1    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding, Financial Guaranty Insurance $ 2,437 $ 2,781
Net Par Outstanding, Credit Derivative 56 70
Total $ 2,493 $ 2,851
Number of Risks, Financial Guaranty Insurance | risk 118 125
Number of Risks, Credit Derivative | rISK 3 6
Number of Risks | rISK 121 131
BIG | BIG 2    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding, Financial Guaranty Insurance $ 185 $ 130
Net Par Outstanding, Credit Derivative 4 4
Total $ 189 $ 134
Number of Risks, Financial Guaranty Insurance | risk 17 19
Number of Risks, Credit Derivative | rISK 1 1
Number of Risks | rISK 18 20
BIG | BIG 3    
Schedule of Insured Financial Obligations [Line Items]    
Net Par Outstanding, Financial Guaranty Insurance $ 4,919 $ 4,944
Net Par Outstanding, Credit Derivative 48 46
Total $ 4,967 $ 4,990
Number of Risks, Financial Guaranty Insurance | risk 124 126
Number of Risks, Credit Derivative | rISK 8 7
Number of Risks | rISK 132 133