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Outstanding Exposure - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 26, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
exposure
Aug. 31, 2023
USD ($)
Jun. 23, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Insured Financial Obligations [Line Items]            
Loss Mitigation Securities   $ 1,200 $ 1,200     $ 1,300
Net Par Outstanding   249,153 249,153 $ 108   233,258
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss   6,307 $ 6,307     7,119
Insured exposure in payment default, number | exposure     1      
Maximum exposure, undiscounted   1,600 $ 1,600      
PREPA            
Schedule of Insured Financial Obligations [Line Items]            
Plaintiff debt capacity         $ 2,500  
Settling creditors         1,400  
Bondholders and general unsecured creditors         $ 1,100  
Claim received as restructuring bonds, percent         12.50%  
PREPA | Guarantee Obligations            
Schedule of Insured Financial Obligations [Line Items]            
Damages sought, estimate $ 2,400          
Calculated collection period 100 years          
Calculated discount rate 7.00%          
Calculated discounted cash flows $ 3,000          
Additional calculated discount rate 20.00%          
Damages sought, value $ 8,500          
Puerto Rico            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   1,105 1,105     1,361
Puerto Rico | Puerto Rico Highways and Transportation Authority            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   372 372      
Proceeds from bonds called   154        
Puerto Rico | Other Puerto Rico Exposures            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   109 109     132
Puerto Rico | Other Puerto Rico Exposures | MFA            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   108 108     131
Puerto Rico Trusts | Variable Interest Entity, Primary Beneficiary | Financial Guaranty Variable Interest Entities            
Schedule of Insured Financial Obligations [Line Items]            
Fixed-maturity securities, available-for-sale, at fair value, net of allowance for credit loss       $ 73   204
Public finance            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   239,296 239,296     224,099
Public finance | Commitment to Provide Guarantees            
Schedule of Insured Financial Obligations [Line Items]            
Outstanding commitments to provide guaranties   193 193      
Structured finance            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   9,857 9,857     9,159
Structured finance | Commitment to Provide Guarantees            
Schedule of Insured Financial Obligations [Line Items]            
Outstanding commitments to provide guaranties   1,700 $ 1,700      
BIG            
Schedule of Insured Financial Obligations [Line Items]            
Maximum period of liquidity claims (in years)     1 year      
Net Par Outstanding   5,437 $ 5,437     5,892
BIG | Puerto Rico            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   1,100 1,100     1,400
BIG | Public finance            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   4,402 4,402     4,777
BIG | Structured finance            
Schedule of Insured Financial Obligations [Line Items]            
Net Par Outstanding   1,035 1,035     1,115
BIG | Aircraft residual value insurance policies            
Schedule of Insured Financial Obligations [Line Items]            
Specialty business, gross par   144 144     144
Specialty business, net par   $ 84 $ 84     $ 84
Minimum            
Schedule of Insured Financial Obligations [Line Items]            
Probability of paying more claims than being reimbursed (as a percent)   50.00% 50.00%