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Fair Value Measurement - Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets:    
Estimated Fair Value $ 6,278 $ 6,369
Fixed-maturity securities, trading 136 147
Short-term investments, at fair value 1,332 1,221
Other invested assets 1,012 926
Other assets 159 131
Liabilities:    
Other liabilities. fair value disclosure 31 34
Obligations of state and political subdivisions    
Assets:    
Estimated Fair Value 1,755 1,940
U.S. government and agencies    
Assets:    
Estimated Fair Value 48 67
Corporate securities    
Assets:    
Estimated Fair Value 2,923 2,382
RMBS    
Assets:    
Estimated Fair Value 603 567
CMBS    
Assets:    
Estimated Fair Value 185 186
Non-U.S. government securities    
Assets:    
Estimated Fair Value 93 69
Recurring    
Assets:    
Estimated Fair Value 6,278 6,369
Fixed-maturity securities, trading 136 147
Short-term investments, at fair value 1,332 1,221
Other invested assets 4 4
Other assets 159 131
Total assets carried at fair value 8,186 8,118
Liabilities:    
Other liabilities. fair value disclosure 31 34
Total liabilities carried at fair value 190 198
Recurring | Financial Guaranty Variable Interest Entities    
Liabilities:    
FG VIEs' liabilities 159 164
Recurring | Financial Guaranty Variable Interest Entities    
Assets:    
FG VIEs’ assets 145 147
Recurring | Obligations of state and political subdivisions    
Assets:    
Estimated Fair Value 1,755 1,940
Recurring | U.S. government and agencies    
Assets:    
Estimated Fair Value 48 67
Recurring | Corporate securities    
Assets:    
Estimated Fair Value 2,923 2,382
Recurring | RMBS    
Assets:    
Estimated Fair Value 603 567
Recurring | CMBS    
Assets:    
Estimated Fair Value 185 186
Recurring | Asset-backed securities    
Assets:    
Estimated Fair Value 671 1,158
Recurring | Non-U.S. government securities    
Assets:    
Estimated Fair Value 93 69
Recurring | Assets of CIVs, Equity Securities | Consolidated Investment Vehicles    
Assets:    
FG VIEs’ assets 132 99
Recurring | Level 1    
Assets:    
Estimated Fair Value 0 0
Fixed-maturity securities, trading 0 0
Short-term investments, at fair value 1,329 1,218
Other invested assets 0 0
Other assets 78 65
Total assets carried at fair value 1,407 1,283
Liabilities:    
Other liabilities. fair value disclosure 0 0
Total liabilities carried at fair value 0 0
Recurring | Level 1 | Financial Guaranty Variable Interest Entities    
Liabilities:    
FG VIEs' liabilities 0 0
Recurring | Level 1 | Financial Guaranty Variable Interest Entities    
Assets:    
FG VIEs’ assets 0 0
Recurring | Level 1 | Obligations of state and political subdivisions    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 1 | U.S. government and agencies    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 1 | Corporate securities    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 1 | RMBS    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 1 | CMBS    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 1 | Asset-backed securities    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 1 | Non-U.S. government securities    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 1 | Assets of CIVs, Equity Securities | Consolidated Investment Vehicles    
Assets:    
FG VIEs’ assets 0 0
Recurring | Level 2    
Assets:    
Estimated Fair Value 5,434 5,183
Fixed-maturity securities, trading 132 142
Short-term investments, at fair value 3 3
Other invested assets 0 0
Other assets 64 59
Total assets carried at fair value 5,633 5,387
Liabilities:    
Other liabilities. fair value disclosure 0 0
Total liabilities carried at fair value 0 0
Recurring | Level 2 | Financial Guaranty Variable Interest Entities    
Liabilities:    
FG VIEs' liabilities 0 0
Recurring | Level 2 | Financial Guaranty Variable Interest Entities    
Assets:    
FG VIEs’ assets 0 0
Recurring | Level 2 | Obligations of state and political subdivisions    
Assets:    
Estimated Fair Value 1,745 1,930
Recurring | Level 2 | U.S. government and agencies    
Assets:    
Estimated Fair Value 48 67
Recurring | Level 2 | Corporate securities    
Assets:    
Estimated Fair Value 2,755 2,382
Recurring | Level 2 | RMBS    
Assets:    
Estimated Fair Value 458 422
Recurring | Level 2 | CMBS    
Assets:    
Estimated Fair Value 185 186
Recurring | Level 2 | Asset-backed securities    
Assets:    
Estimated Fair Value 150 127
Recurring | Level 2 | Non-U.S. government securities    
Assets:    
Estimated Fair Value 93 69
Recurring | Level 2 | Assets of CIVs, Equity Securities | Consolidated Investment Vehicles    
Assets:    
FG VIEs’ assets 0 0
Recurring | Level 3    
Assets:    
Estimated Fair Value 844 1,186
Fixed-maturity securities, trading 4 5
Short-term investments, at fair value 0 0
Other invested assets 4 4
Other assets 17 7
Total assets carried at fair value 1,146 1,448
Liabilities:    
Other liabilities. fair value disclosure 31 34
Total liabilities carried at fair value 190 198
Recurring | Level 3 | Financial Guaranty Variable Interest Entities    
Liabilities:    
FG VIEs' liabilities 159 164
Recurring | Level 3 | Financial Guaranty Variable Interest Entities    
Assets:    
FG VIEs’ assets 145 147
Recurring | Level 3 | Obligations of state and political subdivisions    
Assets:    
Estimated Fair Value 10 10
Recurring | Level 3 | U.S. government and agencies    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 3 | Corporate securities    
Assets:    
Estimated Fair Value 168 0
Recurring | Level 3 | RMBS    
Assets:    
Estimated Fair Value 145 145
Recurring | Level 3 | CMBS    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 3 | Asset-backed securities    
Assets:    
Estimated Fair Value 521 1,031
Recurring | Level 3 | Non-U.S. government securities    
Assets:    
Estimated Fair Value 0 0
Recurring | Level 3 | Assets of CIVs, Equity Securities | Consolidated Investment Vehicles    
Assets:    
FG VIEs’ assets $ 132 $ 99