Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Beginning balance			$ 100
Other comprehensive income (loss) before reclassifications			(317)
Amounts reclassified from AOCI			(14)
Net period other comprehensive income (loss)	$ (149)	$ 64	(331)	$ (12)
Ending balance	(231)		(231)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance			138
Other comprehensive income (loss) before reclassifications			(298)
Amounts reclassified from AOCI			(2)
Net period other comprehensive income (loss)			(300)
Ending balance	(162)		(162)
Foreign currency translation, net [Member]
Beginning balance			(6)
Other comprehensive income (loss) before reclassifications			1
Amounts reclassified from AOCI			0
Net period other comprehensive income (loss)			1
Ending balance	(5)		(5)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]
Beginning balance			(32)
Other comprehensive income (loss) before reclassifications			(20)
Amounts reclassified from AOCI			(12)
Net period other comprehensive income (loss)			(32)
Ending balance	$ (64)		$ (64)