Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Beginning balance			$ (139)
Other comprehensive income (loss) before reclassifications			21
Amounts reclassified from AOCI			30
Total other comprehensive income (loss)	$ 49	$ (50)	51	$ 20
Ending balance	(88)		(88)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance			(134)
Other comprehensive income (loss) before reclassifications			18
Amounts reclassified from AOCI			2
Total other comprehensive income (loss)			20
Ending balance	(114)		(114)
Foreign current 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			(1)
Other comprehensive income (loss) before reclassifications			3
Amounts reclassified from AOCI			28
Total other comprehensive income (loss)			31
Ending balance	$ 30		$ 30