v3.26.1
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
Mar. 31, 2026
Mar. 31, 2025
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange $ 0 $ (15)
Non Variable Interest Entity [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Net gains (losses) on financial instruments at fair value and foreign exchange 0 (15)
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) (2)
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] 0 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] 2 (2)
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] $ 0 $ (2)
[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.