Consolidated Statements of Changes in Shareholder's Equity - USD ($) $ in Millions	Total	Accounting Standards Update 2018-12	Common Stock	Common Stock Accounting Standards Update 2018-12	Additional Paid-In Capital	Additional Paid-In Capital Accounting Standards Update 2018-12	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Accounting Standards Update 2018-12	Retained Earnings (Deficit)	Retained Earnings (Deficit) Accounting Standards Update 2018-12
Beginning Balance at Dec. 31, 2020	$ 4,897	$ 621	$ 3	$ 0	$ 2,873	$ 0	$ 1,882	$ 679	$ 139	$ (58)
Comprehensive income (loss):
Net income (loss)	796		0		0		0		796
Other comprehensive income (loss), after tax	(999)		0		0		(999)		0
Comprehensive income (loss)	(203)
Dividends paid and distributions of capital	(235)		0		318		0		(553)
Ending Balance at Dec. 31, 2021	5,080		3		3,191		1,562		324
Comprehensive income (loss):
Net income (loss)	333		0		0		0		333
Other comprehensive income (loss), after tax	(3,629)		0		0		(3,629)		0
Comprehensive income (loss)	(3,296)
Dividends paid and distributions of capital	(857)		0		(413)		0		(444)
Contribution of capital	0
Ending Balance at Dec. 31, 2022	927		3		2,778		(2,067)		213
Comprehensive income (loss):
Net income (loss)	387		0		0		0		387
Other comprehensive income (loss), after tax	536		0		0		536
Comprehensive income (loss)	923
Dividends paid and distributions of capital	(310)		0		(8)		0		(302)
Contribution of capital	0
Ending Balance at Dec. 31, 2023	$ 1,540		$ 3		$ 2,770		$ (1,531)		$ 298