Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Beginning balance	$ 100	$ 115	$ (2)
Other comprehensive income (loss) before reclassifications	(391)	(39)	130
Amounts reclassified from AOCI	8	24	(13)
Total other comprehensive income (loss)	(383)	(15)	117
Ending balance	(283)	100	115
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	138	176	112
Other comprehensive income (loss) before reclassifications	(362)	(26)	83
Amounts reclassified from AOCI	(10)	(12)	(19)
Total other comprehensive income (loss)	(372)	(38)	64
Ending balance	(234)	138	176
Foreign currency translation, net [Member]
Beginning balance	(6)	(10)	(7)
Other comprehensive income (loss) before reclassifications	2	4	(3)
Amounts reclassified from AOCI	0	0	0
Total other comprehensive income (loss)	2	4	(3)
Ending balance	(4)	(6)	(10)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]
Beginning balance	(32)	(51)	(107)
Other comprehensive income (loss) before reclassifications	(31)	(17)	50
Amounts reclassified from AOCI	18	36	6
Total other comprehensive income (loss)	(13)	19	56
Ending balance	$ (45)	$ (32)	$ (51)