Summary of Significant Accounting Policies - Schedule of Consolidated Statements of Shareholders’ Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	$ 17,363	$ 24,892	$ (298)
Net (loss) income	(213)	(1,342)	1,581
Change in unrealized net capital gains and losses	1,651	(2,853)	(2,583)
Discount rate for reserve for future policy benefits	(10)	228	49
Balance, end of year	17,630	17,363	24,892
Total shareholders’ equity	17,770	17,488	24,944
Total equity	17,630	17,363	24,892
Retained income
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	50,970	53,288	52,767
Net (loss) income	(188)	(1,289)	1,614
Balance, end of year	49,716	50,970	53,288
Total equity	49,716	50,970	53,288
Retained income | Cumulative effect of change in accounting principle
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	0	0	(21)
Balance, end of year		0	0
Total equity		0	0
Accumulated other comprehensive income (loss)
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	(2,392)	426	3,304
Change in unrealized net capital gains and losses	1,651	(2,853)	(2,583)
Discount rate for reserve for future policy benefits	(10)	228	49
Balance, end of year	(700)	(2,392)	426
Total equity	(700)	(2,392)	426
Accumulated other comprehensive income (loss) | Cumulative effect of change in accounting principle
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	0	0	(277)
Balance, end of year		0	0
Total equity		0	0
As reported
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	17,350	25,127
Net (loss) income		(1,364)	1,566
Change in unrealized net capital gains and losses		(2,851)	(2,582)
Discount rate for reserve for future policy benefits		0	0
Balance, end of year		17,350	25,127
Total shareholders’ equity		17,475	25,179
Total equity		17,350	25,127
As reported | Retained income
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	50,954	53,294	52,767
Net (loss) income		(1,311)	1,599
Balance, end of year		50,954	53,294
Total equity		50,954	53,294
As reported | Retained income | Cumulative effect of change in accounting principle
Increase (decrease) in equity [Roll forward]
Balance, beginning of year			0
Total equity
As reported | Accumulated other comprehensive income (loss)
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	(2,389)	655	3,304
Change in unrealized net capital gains and losses		(2,851)	(2,582)
Discount rate for reserve for future policy benefits		0	0
Balance, end of year		(2,389)	655
Total equity		(2,389)	655
As reported | Accumulated other comprehensive income (loss) | Cumulative effect of change in accounting principle
Increase (decrease) in equity [Roll forward]
Balance, beginning of year			0
Total equity
Impact of change
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	13	(235)
Net (loss) income		22	15
Change in unrealized net capital gains and losses		(2)	(1)
Discount rate for reserve for future policy benefits		228	49
Balance, end of year		13	(235)
Total shareholders’ equity		13	(235)
Total equity		13	(235)
Impact of change | Retained income
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	16	(6)	0
Net (loss) income		22	15
Balance, end of year		16	(6)
Total equity		16	(6)
Impact of change | Retained income | Cumulative effect of change in accounting principle
Increase (decrease) in equity [Roll forward]
Balance, beginning of year			(21)
Total equity
Impact of change | Accumulated other comprehensive income (loss)
Increase (decrease) in equity [Roll forward]
Balance, beginning of year	$ (3)	(229)	0
Change in unrealized net capital gains and losses		(2)	(1)
Discount rate for reserve for future policy benefits		228	49
Balance, end of year		(3)	(229)
Total equity		$ (3)	(229)
Impact of change | Accumulated other comprehensive income (loss) | Cumulative effect of change in accounting principle
Increase (decrease) in equity [Roll forward]
Balance, beginning of year			$ (277)
Total equity