v3.25.2
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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange $ (2) $ (55) $ (17) $ (51)
Non Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange (2) (55) (17) (51)
Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 0 1 0 (24)
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] 1 (60) 0 (63)
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 (1) 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] 4 (4) 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] (3) 4 (5) 6
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) $ (14) $ (3) $ (39)
[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.