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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Equity, Attributable to Parent, Beginning Balance     $ (2,089)  
Other comprehensive income (loss) before reclassifications     27  
Amounts reclassified from AOCI     12  
Total other comprehensive income (loss) $ 7 $ 49 39 $ 51
Equity, Attributable to Parent, Ending Balance (2,180)   (2,180)  
Accumulated Other Comprehensive Income [Member]        
Equity, Attributable to Parent, Beginning Balance     (128)  
Equity, Attributable to Parent, Ending Balance (89)   (89)  
Unrealized gains (losses) on AFS, net [Member]        
Other comprehensive income (loss) before reclassifications     29  
Amounts reclassified from AOCI     7  
Total other comprehensive income (loss)     36  
Unrealized gains (losses) on AFS, net [Member] | Accumulated Other Comprehensive Income [Member]        
Equity, Attributable to Parent, Beginning Balance     (150)  
Equity, Attributable to Parent, Ending Balance (114)   (114)  
Foreign Currency translation, net [Member]        
Other comprehensive income (loss) before reclassifications     0  
Amounts reclassified from AOCI     5  
Total other comprehensive income (loss)     5  
Foreign Currency translation, net [Member] | Accumulated Other Comprehensive Income [Member]        
Equity, Attributable to Parent, Beginning Balance     (5)  
Equity, Attributable to Parent, Ending Balance 0   0  
Instrument-specific credit risk of liabilities measured at fair value, net [Member]        
Other comprehensive income (loss) before reclassifications     (2)  
Total other comprehensive income (loss)     (2)  
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Accumulated Other Comprehensive Income [Member]        
Equity, Attributable to Parent, Beginning Balance     27  
Equity, Attributable to Parent, Ending Balance $ 25   $ 25