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Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Beginning balance $ (139) $ (283) $ 100
Other comprehensive income (loss) before reclassifications (20) 32 (391)
Amounts reclassified from AOCI 31 112 8
Total other comprehensive income (loss) 11 144 (383)
Ending balance (128) (139) (283)
Unrealized gains (losses) on AFS, net [Member]      
Beginning balance (134) (234) 138
Other comprehensive income (loss) before reclassifications (19) 33 (362)
Amounts reclassified from AOCI 3 67 (10)
Total other comprehensive income (loss) (16) 100 (372)
Ending balance (150) (134) (234)
Foreign current translation, net [Member]      
Beginning balance (4) (4) (6)
Other comprehensive income (loss) before reclassifications (1) 0 2
Amounts reclassified from AOCI 0 0 0
Total other comprehensive income (loss) (1) 0 2
Ending balance (5) (4) (4)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]      
Beginning balance (1) (45) (32)
Other comprehensive income (loss) before reclassifications 0 (1) (31)
Amounts reclassified from AOCI 28 45 18
Total other comprehensive income (loss) 28 44 (13)
Ending balance $ 27 $ (1) $ (45)