Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Beginning balance			$ (283)
Other comprehensive income (loss) before reclassifications			(41)
Amounts reclassified from AOCI			61
Total other comprehensive income (loss)	$ (50)	$ (83)	20	$ (414)
Ending balance	(263)		(263)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance			(234)
Other comprehensive income (loss) before reclassifications			(37)
Amounts reclassified from AOCI			16
Total other comprehensive income (loss)			(21)
Ending balance	(255)		(255)
Foreign currency translation, net [Member]
Beginning balance			(4)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from AOCI			0
Total other comprehensive income (loss)			0
Ending balance	(4)		(4)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]
Beginning balance			(45)
Other comprehensive income (loss) before reclassifications			(4)
Amounts reclassified from AOCI			45
Total other comprehensive income (loss)			41
Ending balance	$ (4)		$ (4)