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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange $ (55) $ 11 $ (51) $ (1)
Non Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange (55) 11 (51) (1)
Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 1 (21) (24) (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] (60) 0 (63) 3
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) 0 (1) (4)
Loans Receivable 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) (11) (2) (3)
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 2 0 3
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 3 6 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] $ (14) $ (17) $ (39) $ (33)
[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.