Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Beginning balance			$ (283)
Other comprehensive income (loss) before reclassifications			23
Amounts reclassified from AOCI			47
Total other comprehensive income (loss)	$ 8	$ (149)	70	$ (331)
Ending balance	(213)		(213)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance			(234)
Other comprehensive income (loss) before reclassifications			28
Amounts reclassified from AOCI			13
Total other comprehensive income (loss)			41
Ending balance	(193)		(193)
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			(5)
Amounts reclassified from AOCI			34
Total other comprehensive income (loss)			29
Ending balance	$ (16)		$ (16)