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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange $ (42) $ 4 $ 45
Non Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange (42) 4 45
Variable Interest Entity [Member]      
Accounts Notes And Loans Receivable [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange (23) (45) (14)
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] (55) 1 (17)
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] (1) (4) (5)
Loans Receivable and Other Instruments at Fair Value [Member] | Variable Interest Entity [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] (4) (33) 10
Other Assets [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 4 9
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] 4 (5) 24
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] $ (40) $ (25) $ (20)
[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 "Other net realized gains (losses)-VIE" on the Company's consolidated statements of operations.