Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income (loss) before income taxes	$ (35)	$ (123)	$ (144)	$ (290)
Net gains (losses) on financial instruments at fair value and foreign exchange	25	9	51	41
Net income (loss)	(34)	(123)	(143)	(290)
Amounts reclassified from AOCI [Member]
Net income (loss)	(20)	(9)	(6)	(25)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net realized investment gains (losses)	3	3	5	11
Income (loss) before income taxes	3	3	5	11
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Amounts reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange	$ (23)	$ (12)	$ (11)	$ (36)