Accumulated Other Comprehensive Income (Changes In The Components Of AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Beginning balance	$ (139)
Other comprehensive income (loss) before reclassifications	(11)
Amounts reclassified from AOCI	19
Total other comprehensive income (loss)	8	$ 62
Ending balance	(131)
Unrealized gains (losses) on AFS, net [Member]
Beginning balance	(134)
Other comprehensive income (loss) before reclassifications	(15)
Amounts reclassified from AOCI	0
Total other comprehensive income (loss)	(15)
Ending balance	(149)
Foreign current 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)
Instrument-specific credit risk of liabilities measured at fair value, net [Member]
Beginning balance	(1)
Other comprehensive income (loss) before reclassifications	4
Amounts reclassified from AOCI	19
Total other comprehensive income (loss)	23
Ending balance	$ 22