Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Beginning balance			$ (139)
Other comprehensive income (loss) before reclassifications			(28)
Amounts reclassified from AOCI			30
Total other comprehensive income (loss)	$ (6)	$ 8	2	$ 70
Ending balance	(137)		(137)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance			(134)
Other comprehensive income (loss) before reclassifications			(26)
Amounts reclassified from AOCI			2
Total other comprehensive income (loss)			(24)
Ending balance	(158)		(158)
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			(2)
Amounts reclassified from AOCI			28
Total other comprehensive income (loss)			26
Ending balance	$ 25		$ 25

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

Amount after tax of reclassification adjustments of other comprehensive income (loss).