Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Beginning balance	$ (283)
Other comprehensive income (loss) before reclassifications	43
Amounts reclassified from AOCI	19
Total other comprehensive income (loss)	62	$ (182)
Ending balance	(221)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	(234)
Other comprehensive income (loss) before reclassifications	43
Amounts reclassified from AOCI	5
Total other comprehensive income (loss)	48
Ending balance	(186)
Foreign currency translation, net [Member]
Beginning balance	(4)
Other comprehensive income (loss) before reclassifications	(1)
Amounts reclassified from AOCI	0
Total other comprehensive income (loss)	(1)
Ending balance	(5)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]
Beginning balance	(45)
Other comprehensive income (loss) before reclassifications	1
Amounts reclassified from AOCI	14
Total other comprehensive income (loss)	15
Ending balance	$ (30)