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Debt (Principal Payments For Investment Agreements, MTNs and VIE Obligations) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Total expected principal payments $ 2,741 $ 2,585
Investment Agreement Obligations [Member]    
Debt Instrument [Line Items]    
2025 35  
2026 58  
2027 29  
2028 29  
2029 0  
Thereafter 63  
Total expected principal payments [1] 214  
Less discount and other adjustments [2] 10  
Total 204  
Accrued interest 4  
Carrying amount adjustment $ 2  
Latest maturity year 2037  
Medium-term Notes [Member]    
Debt Instrument [Line Items]    
2025 $ 0  
2026 0  
2027 2  
2028 30  
2029 0  
Thereafter 567  
Total expected principal payments [3] 599  
Less discount and other adjustments [4] 159  
Total 440  
Accrued interest 3  
Carrying amount adjustment $ 9  
Latest maturity year 2035  
Variable Interest Entity Debt [Member] | International And Structured Finance Insurance [Member]    
Debt Instrument [Line Items]    
Latest maturity year 2035  
Variable Interest Entity Debt [Member] | MBIA insured Variable Interest Entity [Member]    
Debt Instrument [Line Items]    
2025 $ 10  
2026 8  
2027 8  
2028 4  
2029 2  
Thereafter 4  
Total expected principal payments $ 36  
[1] Amounts reflect principal due at maturity for investment agreements issued at a discount.
[2] Discount is net of carrying amount adjustment of $2 million and accrued interest adjustment of $4 million.
[3] Amounts reflect principal due at maturity for notes issued at a discount.
[4] Discount is net of carrying amount and market value adjustments of $9 million and accrued interest adjustment of $3 million.