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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Equity, Attributable to Parent, Beginning Balance $ (2,089)  
Other comprehensive income (loss) before reclassifications 17  
Amounts reclassified from AOCI 12  
Total other comprehensive income (loss) 29 $ 8
Equity, Attributable to Parent, Ending Balance (2,126)  
Accumulated Other Comprehensive Income [Member]    
Equity, Attributable to Parent, Beginning Balance (128)  
Equity, Attributable to Parent, Ending Balance (99)  
Unrealized gains (losses) on AFS, net [Member]    
Other comprehensive income (loss) before reclassifications 17  
Amounts reclassified from AOCI 7  
Total other comprehensive income (loss) 24  
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 (126)  
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  
Instrument-specific credit risk of liabilities measured at fair value, net [Member]    
Other comprehensive income (loss) before reclassifications 0  
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 $ 27