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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange $ 3 $ (2) $ 3 $ (17)
Non Variable Interest Entity [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Net gains (losses) on financial instruments at fair value and foreign exchange 3 (2) 3 (17)
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] (4) 1 (5) 0
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] 2 4 2 7
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] 1 (3) 3 (5)
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 $ (1) $ 0 $ (3)
[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.