Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net gains (losses) on financial instruments at fair value and foreign exchange	$ 11	$ 9	$ (1)	$ 26
Net income (loss)	(74)	(36)	(167)	(109)
Amounts reclassified from AOCI [Member]
Net income (loss)	(28)	17	(47)	14
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net realized investment gains (losses)	(8)	2	(13)	2
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Amounts reclassified from AOCI [Member]
Other net realized gains (losses)	(7)	0	(21)	0
Net gains (losses) on financial instruments at fair value and foreign exchange	$ (13)	$ 15	$ (13)	$ 12