Schedule II (Condensed Statements Of Operations) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Income Statements, Captions [Line Items]
Net gains (losses) on financial instruments at fair value and foreign exchange	$ (38)	$ 52	$ (17)
Investment losses related to other-than-temporary impairments:
Net gains (losses) on extinguishment of debt		(1)	3
Other net realized gains (losses)	0	4	0
Total revenues	282	280	162
Interest	178	201	206
Provision (benefit) for income taxes	0	2	0
Net income (loss)	(578)	(359)	(296)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Net investment income	28	35	35
Net gains (losses) on financial instruments at fair value and foreign exchange	(67)	(57)	20
Investment losses related to other-than-temporary impairments:
Net gains (losses) on extinguishment of debt	0	(1)	3
Other net realized gains (losses)	0	(2)	(2)
Total revenues	(39)	(25)	56
Operating	10	10	11
Interest	83	90	93
Total expenses	93	100	104
Gain (loss) before income taxes and equity in earnings of subsidiaries	(132)	(125)	(48)
Provision (benefit) for income taxes	(4)	(99)	(35)
Gain (loss) before equity in earnings of subsidiaries	(128)	(26)	(13)
Equity in net income (loss) of subsidiaries	(450)	(333)	(283)
Net income (loss)	$ (578)	$ (359)	$ (296)