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Fair Value of Financial Instruments (Gains And Losses On Fair Value Option Included In The Company's Consolidated Statements Of Operations) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange $ (12) $ (5) $ (29) $ (56)
Non Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange (12) (5) (29) (56)
Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 2 1 2 (23)
Investments Carried At Fair Value [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange [1] (18) 2 (19) (61)
Fixed Maturity Securities Held At Fair Value - VIE [Member] | Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange [2] (0) 0 0 (1)
Loans Receivable at Fair Value [Member] | Residential Mortgage Loans [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange [2] 1 0 7 (2)
Medium Term Notes [Member] | Non Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange [1] 0 (6) (5) 0
Variable Interest Entity Notes [Member] | Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange [2] $ (1) $ (1) $ (3) $ (40)
[1] Reported within "Net gains (losses) on financial instruments at fair value and foreign exchange" on the Company's consolidated statements of operations.
[2] Reported within "Net gains (losses) on financial instruments at fair value and foreign exchange-VIE" and/or "Other net realized gains (losses)-VIE" on the Company's consolidated statements of operations.