Schedule II - Condensed Statements Of Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Investment income received	$ 105	$ 92	$ 77
Operating expenses paid and other operating	(71)	(97)	(88)
Interest paid, net of interest converted to principal	(64)	(43)	(61)
Income taxes (paid) received	0	(1)	0
Net cash provided (used) by operating activities	(195)	(418)	511
Cash flows from investing activities:
Purchases of available-for-sale investments	(366)	(1,009)	(1,163)
Sales of available-for-sale investments	943	1,100	597
Paydowns and maturities of available-for-sale investments	214	411	626
Purchases of investments at fair value	(77)	(148)	(206)
Sales, paydowns and maturities of investments at fair value	279	228	174
Sales, paydowns and maturities (purchases) of short-term investments, net	(186)	31	(99)
(Payments) proceeds for derivative settlements	(38)	(10)	(66)
Net cash provided (used) by investing activities	767	623	(61)
Cash flows from financing activities:
Proceeds from investment agreements	7	8	2
Principal paydowns of investment agreements	(12)	(54)	(2)
Dividends paid	(409)	0	0
Purchases of treasury stock	(38)	(3)	(1)
Net cash provided (used) by financing activities	(542)	(285)	(457)
Effect of exchange rates on cash and cash equivalents	0	(2)	0
Reconciliation of net income (loss) to net cash provided (used) by operating activities:
Net income (loss)	(491)	(195)	(445)
Change in:
Net realized investment gains (losses)	76	41	(5)
Net (gains) losses on financial instruments at fair value and foreign exchange	41	(31)	(35)
Other operating	26	22	33
Total adjustments to income (loss) from continuing operations	289	(269)	956
Net cash provided (used) by operating activities	(195)	(418)	511
Parent Company [Member]
Cash flows from operating activities:
Investment income received	369	89	80
Operating expenses paid and other operating	(16)	(25)	(14)
Interest paid, net of interest converted to principal	(72)	(51)	(50)
Income taxes (paid) received	1	(1)	6
Net cash provided (used) by operating activities	282	12	22
Cash flows from investing activities:
Purchases of available-for-sale investments	(67)	(86)	(150)
Sales of available-for-sale investments	289	149	202
Paydowns and maturities of available-for-sale investments	65	18	20
Purchases of investments at fair value	0	0	(2)
Sales, paydowns and maturities of investments at fair value	0	0	3
Sales, paydowns and maturities (purchases) of short-term investments, net	(380)	(41)	(27)
(Payments) proceeds for derivative settlements	(38)	(10)	(17)
Return of capital from subsidiaries	295	74	11
Net cash provided (used) by investing activities	164	104	40
Cash flows from financing activities:
Proceeds from investment agreements	7	8	2
Principal paydowns of investment agreements	(12)	(54)	(2)
Dividends paid	(409)	0	0
Payments for affiliate loans	(15)	(74)	(81)
Purchases of treasury stock	(6)	0	0
Restricted stock awards settlements	6	6	8
Net cash provided (used) by financing activities	(429)	(114)	(73)
Effect of exchange rates on cash and cash equivalents	0	(1)	0
Net increase (decrease) in cash and cash equivalents	17	1	(11)
Cash and cash equivalents - beginning of year	16	15	26
Cash and cash equivalents - end of year	33	16	15
Reconciliation of net income (loss) to net cash provided (used) by operating activities:
Net income (loss)	(491)	(195)	(445)
Change in:
Intercompany accounts receivable	(20)	(25)	(7)
Current income taxes	1	(1)	6
Equity in earnings of subsidiaries	395	235	465
Dividends from subsidiaries	352	72	60
Net realized investment gains (losses)	32	10	0
Net (gains) losses on financial instruments at fair value and foreign exchange	(4)	(110)	(52)
Deferred income tax provision (benefit)	(1)	(3)	(3)
(Gains) losses on extinguishment of debt	(1)	(5)	(30)
Other operating	19	34	28
Total adjustments to income (loss) from continuing operations	773	207	467
Net cash provided (used) by operating activities	$ 282	$ 12	$ 22