Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income (loss) before income taxes	$ (445)	$ (578)	$ (357)
Net gains (losses) on financial instruments at fair value and foreign exchange	40	(86)	(78)
Net income (loss)	(445)	(578)	(359)
Amounts reclassified from AOCI [Member]
Net income (loss)	(24)	13	(40)
Unrealized gains (losses) on AFS, net [Member]
Net income (loss)	12	19	(12)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]
Net realized investment gains (losses)	12	19	14
Net investment losses related to OTTI	0	0	(25)
Net investment income	0	0	(1)
Income (loss) before income taxes	12	19	(12)
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	$ (36)	$ (6)	$ (28)