Schedule II (Condensed Statements Of Operations) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investment losses related to other-than-temporary impairments:
Net gains (losses) on extinguishment of debt	$ (1)
Total revenues	280	$ 162	$ 433
Provision (benefit) for income taxes	2	0	944
Net income (loss)	(359)	(296)	(1,605)
Parent Company [Member]
Condensed Income Statements, Captions [Line Items]
Net investment income	35	35	35
Net gains (losses) on financial instruments at fair value and foreign exchange	(57)	20	(34)
Investment losses related to other-than-temporary impairments:
Net gains (losses) on extinguishment of debt	(1)	3	28
Other net realized gains (losses)	(2)	(2)	(3)
Total revenues	(25)	56	26
Operating	10	11	13
Interest	90	93	87
Total expenses	100	104	100
Gain (loss) before income taxes and equity in earnings of subsidiaries	(125)	(48)	(74)
Provision (benefit) for income taxes	(99)	(35)	507
Gain (loss) before equity in earnings of subsidiaries	(26)	(13)	(581)
Equity in net income (loss) of subsidiaries	(333)	(283)	(1,024)
Net income (loss)	$ (359)	$ (296)	$ (1,605)