Consolidated Statements of Changes in Shareholder's Equity - USD ($) $ in Millions	Total	Adjustment for adoption of ASU 2016-01	Accounting Standards Update 2016-13	Common Stock	Common Stock Adjustment for adoption of ASU 2016-01	Common Stock Accounting Standards Update 2016-13	Additional Paid-In Capital	Additional Paid-In Capital Adjustment for adoption of ASU 2016-01	Additional Paid-In Capital Accounting Standards Update 2016-13	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Adjustment for adoption of ASU 2016-01	Accumulated Other Comprehensive Income (Loss) Accounting Standards Update 2016-13	Retained Earnings (Deficit)	Retained Earnings (Deficit) Adjustment for adoption of ASU 2016-01	Retained Earnings (Deficit) Accounting Standards Update 2016-13
Beginning Balance at Dec. 31, 2018	$ 3,435.0	$ 0.0		$ 3.0	$ 0.0		$ 2,816.0	$ 0.0		$ 108.0	$ 137.0		$ 508.0	$ (137.0)
Comprehensive income (loss):
Net income (loss)	300.0			0.0			0.0			0.0			300.0
Other comprehensive income (loss), after tax	1,047.0			0.0			0.0			1,047.0			0.0
Comprehensive income (loss)	1,347.0
Dividends paid and distributions of capital	(396.0)			0.0			0.0			0.0			(396.0)
Contribution of capital	57.0			0.0			57.0			0.0			0.0
Ending Balance at Dec. 31, 2019	4,443.0		$ (8.0)	3.0		$ 0.0	2,873.0		$ 0.0	1,292.0		$ 0.0	275.0		$ (8.0)
Comprehensive income (loss):
Net income (loss)	166.0			0.0			0.0			0.0			166.0
Other comprehensive income (loss), after tax	590.0			0.0			0.0			590.0			0.0
Comprehensive income (loss)	756.0
Dividends paid and distributions of capital	(294.0)			0.0			0.0			0.0			(294.0)
Contribution of capital	0.0
Ending Balance at Dec. 31, 2020	4,897.0			3.0			2,873.0			1,882.0			139.0
Comprehensive income (loss):
Net income (loss)	826.0			0.0			0.0			0.0			826.0
Other comprehensive income (loss), after tax	(459.0)			0.0			0.0			(459.0)			0.0
Comprehensive income (loss)	367.0
Dividends paid and distributions of capital	(552.0)			0.0			0.0			0.0			(552.0)
Contribution of capital	318.0			0.0			318.0			0.0			0.0
Ending Balance at Dec. 31, 2021	$ 5,030.0			$ 3.0			$ 3,191.0			$ 1,423.0			$ 413.0