CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Capital in Excess of Par Value	Capital in Excess of Par Value Cumulative Effect, Period of Adoption, Adjustment	Accumulated Undistributed (Overdistributed) Earnings	Accumulated Undistributed (Overdistributed) Earnings Cumulative Effect, Period of Adoption, Adjustment
Beginning balance (in shares) at Dec. 31, 2020			423,000,000
Beginning balance at Dec. 31, 2020	$ 7,176		$ 0	$ 7,656		$ (480)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)			14,000,000
Issuances of common stock (net of offering and underwriting costs)	249			249
Shares issued in connection with dividend reinvestment plan	9			9
Net investment income	144					144
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	16					16
Net unrealized gains on investments, foreign currency and other transactions	213					213
Dividends declared and payable	(175)					(175)
Ending balance (in shares) at Mar. 31, 2021			437,000,000
Ending balance at Mar. 31, 2021	7,632		$ 0	7,914		(282)
Beginning balance (in shares) at Dec. 31, 2020			423,000,000
Beginning balance at Dec. 31, 2020	7,176		$ 0	7,656		(480)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net investment income	499
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	267
Net unrealized gains on investments, foreign currency and other transactions	$ 462
Shares issued in connection with dividend reinvestment plan (in shares)	1,500,000
Ending balance (in shares) at Sep. 30, 2021			461,000,000
Ending balance at Sep. 30, 2021	$ 8,537		$ 0	8,373		164
Beginning balance (in shares) at Dec. 31, 2020			423,000,000
Beginning balance at Dec. 31, 2020	7,176		$ 0	7,656		(480)
Ending balance (in shares) at Dec. 31, 2021			468,000,000
Ending balance at Dec. 31, 2021	$ 8,868	$ (2)	$ 0	8,553	$ (4)	315	$ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06
Beginning balance (in shares) at Mar. 31, 2021			437,000,000
Beginning balance at Mar. 31, 2021	$ 7,632		$ 0	7,914		(282)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)			7,000,000
Issuances of common stock (net of offering and underwriting costs)	135			135
Shares issued in connection with dividend reinvestment plan	10			10
Net investment income	171					171
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	59					59
Net unrealized gains on investments, foreign currency and other transactions	248					248
Dividends declared and payable	(177)					(177)
Shares issued in connection with dividend reinvestment plan (in shares)			1,000,000
Ending balance (in shares) at Jun. 30, 2021			445,000,000
Ending balance at Jun. 30, 2021	8,078		$ 0	8,059		19
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)			15,000,000
Issuances of common stock (net of offering and underwriting costs)	304			304
Shares issued in connection with dividend reinvestment plan	10			10
Net investment income	184					184
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	149					149
Net unrealized gains on investments, foreign currency and other transactions	1					1
Dividends declared and payable	(189)					(189)
Shares issued in connection with dividend reinvestment plan (in shares)			1,000,000
Ending balance (in shares) at Sep. 30, 2021			461,000,000
Ending balance at Sep. 30, 2021	8,537		$ 0	8,373		164
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)			6,000,000
Issuances of common stock (net of offering and underwriting costs)	131			131
Shares issued in connection with dividend reinvestment plan	9			9
Net investment income	242					242
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	16					16
Net unrealized gains on investments, foreign currency and other transactions	124					124
Dividends declared and payable	(191)					(191)
Shares issued in connection with dividend reinvestment plan (in shares)			1,000,000
Tax reclassification of stockholders’ equity in accordance with GAAP	0			40		(40)
Ending balance (in shares) at Dec. 31, 2021			468,000,000
Ending balance at Dec. 31, 2021	8,868	(2)	$ 0	8,553	(4)	315	2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)			25,000,000
Issuances of common stock (net of offering and underwriting costs)	510			510
Shares issued in connection with dividend reinvestment plan	12			12
Net investment income	198					198
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	10					10
Net unrealized gains on investments, foreign currency and other transactions	3					3
Dividends declared and payable	(220)					(220)
Ending balance (in shares) at Mar. 31, 2022			493,000,000
Ending balance at Mar. 31, 2022	9,379		$ 0	9,071		308
Beginning balance (in shares) at Dec. 31, 2021			468,000,000
Beginning balance at Dec. 31, 2021	8,868	$ (2)	$ 0	8,553	$ (4)	315	$ 2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net investment income	743
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	55
Net unrealized gains on investments, foreign currency and other transactions	$ (324)
Shares issued in connection with dividend reinvestment plan (in shares)	600,000
Ending balance (in shares) at Sep. 30, 2022			508,000,000
Ending balance at Sep. 30, 2022	$ 9,436		$ 0	9,370		66
Beginning balance (in shares) at Mar. 31, 2022			493,000,000
Beginning balance at Mar. 31, 2022	9,379		$ 0	9,071		308
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)			3,000,000
Issuances of common stock (net of offering and underwriting costs)	68			68
Net investment income	257					257
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	(3)					(3)
Net unrealized gains on investments, foreign currency and other transactions	(143)					(143)
Dividends declared and payable	(223)					(223)
Ending balance (in shares) at Jun. 30, 2022			496,000,000
Ending balance at Jun. 30, 2022	9,335		$ 0	9,139		196
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)			12,000,000
Issuances of common stock (net of offering and underwriting costs)	231			231
Net investment income	288					288
Net realized gains on investments, foreign currency, extinguishment of debt and other transactions	0
Net unrealized gains on investments, foreign currency and other transactions	(184)					(184)
Dividends declared and payable						(234)
Ending balance (in shares) at Sep. 30, 2022			508,000,000
Ending balance at Sep. 30, 2022	$ 9,436		$ 0	$ 9,370		$ 66