Schedule II - Condensed Statements Of Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Investment income received	$ 92	$ 77	$ 118
Interest paid, net of interest converted to principal	(43)	(61)	(84)
Income taxes (paid) received	(1)	0	13
Net cash provided (used) by operating activities	(418)	511	(390)
Cash flows from investing activities:
Sales of available-for-sale investments	1,100	597	1,095
Paydowns and maturities of available-for-sale investments	411	626	724
Purchases of investments at fair value	(148)	(206)	(179)
Sales, paydowns and maturities of investments at fair value	228	174	198
Sales, paydowns and maturities (purchases) of short-term investments, net	31	(99)	143
(Payments) proceeds for derivative settlements	(10)	(66)	(16)
Net cash provided (used) by investing activities	623	(61)	1,738
Cash flows from financing activities:
Proceeds from investment agreements	8	2	12
Principal paydowns of investment agreements	(54)	(2)	(48)
Net cash provided (used) by financing activities	(285)	(457)	(1,265)
Effect of exchange rates on cash and cash equivalents	(2)	0	1
Reconciliation of net income (loss) to net cash provided (used) by operating activities: [Abstract]
Net income (loss)	(195)	(445)	(578)
Change in: [Abstract]
Net realized investment gains (losses)	(41)	5	48
Net (gains) losses on financial instruments at fair value and foreign exchange	(31)	(35)	(29)
Deferred income tax provision (benefit)	0	0	12
Other operating	18	25	53
Total adjustments to net income (loss)	(269)	956	188
Net cash provided (used) by operating activities	(418)	511	(390)
Parent Company [Member]
Cash flows from operating activities:
Investment income received	89	80	101
Operating expenses paid and other operating	(25)	(14)	(47)
Interest paid, net of interest converted to principal	(51)	(50)	(60)
Income taxes (paid) received	(1)	6	5
Net cash provided (used) by operating activities	12	22	(1)
Cash flows from investing activities:
Purchases of available-for-sale investments	(86)	(150)	(216)
Sales of available-for-sale investments	149	202	183
Paydowns and maturities of available-for-sale investments	18	20	41
Purchases of investments at fair value	0	(2)	(2)
Sales, paydowns and maturities of investments at fair value	0	3	2
Sales, paydowns and maturities (purchases) of short-term investments, net	(41)	(27)	137
(Payments) proceeds for derivative settlements	(10)	(17)	(16)
Return of capital from subsidiaries	74	11	0
Net cash provided (used) by investing activities	104	40	129
Cash flows from financing activities:
Proceeds from investment agreements	8	2	12
Principal paydowns of investment agreements	(54)	(2)	(18)
Principal paydowns of long-term debt	0	0	(115)
Payments for affiliate loans	(74)	(81)	0
Restricted stock awards settlements	6	8	8
Net cash provided (used) by financing activities	(114)	(73)	(113)
Effect of exchange rates on cash and cash equivalents	(1)	0	0
Net increase (decrease) in cash and cash equivalents	1	(11)	15
Cash and cash equivalents - beginning of period	15	26	11
Cash and cash equivalents - end of period	16	15	26
Reconciliation of net income (loss) to net cash provided (used) by operating activities: [Abstract]
Net income (loss)	(195)	(445)	(578)
Change in: [Abstract]
Intercompany accounts receivable	(25)	(7)	(39)
Current income taxes	(1)	6	5
Equity in earnings of subsidiaries	235	465	450
Dividends from subsidiaries	72	60	81
Net realized investment gains (losses)	10	0	0
Net (gains) losses on financial instruments at fair value and foreign exchange	(110)	(52)	67
Deferred income tax provision (benefit)	(3)	(3)	(4)
(Gains) losses on extinguishment of debt	(5)	(30)	0
Other operating	34	28	17
Total adjustments to net income (loss)	207	467	577
Net cash provided (used) by operating activities	$ 12	$ 22	$ (1)