Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income (loss) before income taxes	$ (73)	$ (106)
Net gains (losses) on financial instruments at fair value and foreign exchange	17	52
Net income (loss)	(73)	(106)
Amounts reclassified from AOCI [Member]
Net income (loss)	(3)	(15)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net realized investment gains (losses)	0	5
Income (loss) before income taxes	0	5
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	$ (3)	$ (20)