Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income (loss) before income taxes	$ (148)	$ (445)	$ (578)
Net gains (losses) on financial instruments at fair value and foreign exchange	45	40	(80)
Net income (loss)	(195)	(445)	(578)
Amounts reclassified from AOCI [Member]
Net income (loss)	(8)	(24)	13
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net realized investment gains (losses)	10	12	19
Income (loss) before income taxes	10	12	19
Net income (loss)	10	12	19
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	$ (18)	$ (36)	$ (6)