Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income (loss) before income taxes	$ (36)	$ (61)	$ (109)	$ (167)
Net gains (losses) on financial instruments at fair value and foreign exchange	9	(20)	26	32
Net income (loss)	(36)	(61)	(109)	(167)
Amounts reclassified from AOCI [Member]
Net income (loss)	17	(1)	14	(16)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net realized investment gains (losses)	2	3	2	8
Income (loss) before income taxes	2	3	2	8
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	$ 15	$ (4)	$ 12	$ (24)