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Fair Value Measurement - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
Security
Trust
Dec. 31, 2022
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Repurchase agreement liability $ 36 $ 35
Financial guaranty variable interest entities' assets $ 413 413
Assured IM    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Obligation to purchase debt 0.05  
AGC And AGM    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Number of custodial trusts | Trust 4  
Share value, amount $ 200  
Maximum amount 50  
Fair Value Measured at Net Asset Value Per Share | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financial guaranty variable interest entities' assets 5 5
Recurring | Consolidated Investment Vehicles    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financial guaranty variable interest entities' assets 5,062 5,231
Recurring | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financial guaranty variable interest entities' assets $ 334 302
Recurring | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Number of fixed maturity securities valued using model processes | Security 190  
Recurring | Level 3 | Consolidated Investment Vehicles    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financial guaranty variable interest entities' assets $ 439 $ 439
Recurring | Level 3 | CDR | Total | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 2.59% 2.78%
Recurring | Level 3 | CDR | Total | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 5.06% 5.08%
Recurring | Level 3 | Fund investments: | Equity securities and warrants | Consolidated Investment Vehicles    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Financial guaranty variable interest entities' assets $ 329 $ 297