Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Beginning balance	$ 115	$ (2)	$ (156)
Other comprehensive income (loss) before reclassifications	(39)	130	114
Amounts reclassified from AOCI	24	(13)	40
Total other comprehensive income (loss)	(15)	117	154
Ending balance	100	115	(2)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	176	112	(39)
Other comprehensive income (loss) before reclassifications	(26)	83	139
Amounts reclassified from AOCI	(12)	(19)	12
Total other comprehensive income (loss)	(38)	64	151
Ending balance	138	176	112
Foreign currency translation, net [Member]
Beginning balance	(10)	(7)	(7)
Other comprehensive income (loss) before reclassifications	4	(3)	0
Amounts reclassified from AOCI	0	0	0
Total other comprehensive income (loss)	4	(3)	0
Ending balance	(6)	(10)	(7)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]
Beginning balance	(51)	(107)	(110)
Other comprehensive income (loss) before reclassifications	(17)	50	(25)
Amounts reclassified from AOCI	36	6	28
Total other comprehensive income (loss)	19	56	3
Ending balance	$ (32)	$ (51)	$ (107)