CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Accumulated Undistributed (Overdistributed) Earnings
Beginning balance (in shares) at Dec. 31, 2022		519,000,000
Beginning balance at Dec. 31, 2022	$ 9,555	$ 1	$ 9,556	$ (2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)		26,000,000
Issuances of common stock (net of offering and underwriting costs)	477		477
Net investment income	318			318
Net realized gains (losses) on investments, foreign currency, extinguishment of debt and other transactions	(50)			(50)
Net unrealized gains on investments, foreign currency and other transactions	10			10
Dividends declared and payable	(261)			(261)
Ending balance (in shares) at Mar. 31, 2023		545,000,000
Ending balance at Mar. 31, 2023	10,049	$ 1	10,033	15
Beginning balance (in shares) at Dec. 31, 2022		519,000,000
Beginning balance at Dec. 31, 2022	$ 9,555	$ 1	9,556	(2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued in connection with dividend reinvestment plan (in shares)	1,700,000
Net investment income	$ 921
Net unrealized gains on investments, foreign currency and other transactions	395
Ending balance (in shares) at Sep. 30, 2023		569,000,000
Ending balance at Sep. 30, 2023	10,815	$ 1	10,505	309
Beginning balance (in shares) at Mar. 31, 2023		545,000,000
Beginning balance at Mar. 31, 2023	10,049	$ 1	10,033	15
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)	227		227
Shares issued in connection with dividend reinvestment plan	13		13
Net investment income	314			314
Net realized gains (losses) on investments, foreign currency, extinguishment of debt and other transactions	(81)			(81)
Net unrealized gains on investments, foreign currency and other transactions	98			98
Dividends declared and payable	(266)			(266)
Ending balance (in shares) at Jun. 30, 2023		557,000,000
Ending balance at Jun. 30, 2023	10,354	$ 1	10,273	80
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)		11,000,000
Issuances of common stock (net of offering and underwriting costs)	215		215
Shares issued in connection with dividend reinvestment plan (in shares)		1,000,000
Shares issued in connection with dividend reinvestment plan	17		17
Net investment income	289			289
Net realized gains (losses) on investments, foreign currency, extinguishment of debt and other transactions	(76)			(76)
Net unrealized gains on investments, foreign currency and other transactions	287			287
Dividends declared and payable	(271)			(271)
Ending balance (in shares) at Sep. 30, 2023		569,000,000
Ending balance at Sep. 30, 2023	10,815	$ 1	10,505	309
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)	236		236
Shares issued in connection with dividend reinvestment plan (in shares)		1,000,000
Shares issued in connection with dividend reinvestment plan	17		17
Net investment income	345			345
Net realized gains (losses) on investments, foreign currency, extinguishment of debt and other transactions	28			28
Net unrealized gains on investments, foreign currency and other transactions	40			40
Dividends declared and payable	(280)			(280)
Tax reclassification of stockholders’ equity in accordance with GAAP	$ 0		(20)	20
Ending balance (in shares) at Dec. 31, 2023	582,000,000	582,000,000
Ending balance at Dec. 31, 2023	$ 11,201	$ 1	10,738	462
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)		5,000,000
Issuances of common stock (net of offering and underwriting costs)	85		85
Shares issued in connection with dividend reinvestment plan (in shares)		1,000,000
Shares issued in connection with dividend reinvestment plan	21		21
Net investment income	325			325
Net realized gains (losses) on investments, foreign currency, extinguishment of debt and other transactions	(32)			(32)
Net unrealized gains on investments, foreign currency and other transactions	156			156
Conversion of 2024 Convertible Notes (in shares)		20,000,000
Conversion of 2024 Convertible Notes	407		407
Dividends declared and payable	(291)			(291)
Ending balance (in shares) at Mar. 31, 2024		608,000,000
Ending balance at Mar. 31, 2024	$ 11,872	$ 1	11,251	620
Beginning balance (in shares) at Dec. 31, 2023	582,000,000	582,000,000
Beginning balance at Dec. 31, 2023	$ 11,201	$ 1	10,738	462
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued in connection with dividend reinvestment plan (in shares)	3,000,000.0
Net investment income	$ 1,044
Net unrealized gains on investments, foreign currency and other transactions	$ 165
Ending balance (in shares) at Sep. 30, 2024	646,000,000	646,000,000
Ending balance at Sep. 30, 2024	$ 12,773	$ 1	12,044	728
Beginning balance (in shares) at Mar. 31, 2024		608,000,000
Beginning balance at Mar. 31, 2024	11,872	$ 1	11,251	620
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of common stock (net of offering and underwriting costs) (in shares)		21,000,000
Issuances of common stock (net of offering and underwriting costs)	449		449
Shares issued in connection with dividend reinvestment plan (in shares)		1,000,000
Shares issued in connection with dividend reinvestment plan	21		21
Net investment income	358			358
Net realized gains (losses) on investments, foreign currency, extinguishment of debt and other transactions	12			12
Net unrealized gains on investments, foreign currency and other transactions	(48)			(48)
Dividends declared and payable	(300)			(300)
Ending balance (in shares) at Jun. 30, 2024		630,000,000
Ending balance at Jun. 30, 2024	12,364	$ 1	11,721	642
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)	302		302
Shares issued in connection with dividend reinvestment plan (in shares)		1,000,000
Shares issued in connection with dividend reinvestment plan	21		21
Net investment income	361			361
Net realized gains (losses) on investments, foreign currency, extinguishment of debt and other transactions	(24)			(24)
Net unrealized gains on investments, foreign currency and other transactions	57			57
Dividends declared and payable	$ (308)			(308)
Ending balance (in shares) at Sep. 30, 2024	646,000,000	646,000,000
Ending balance at Sep. 30, 2024	$ 12,773	$ 1	$ 12,044	$ 728