INCOME AND EXCISE TAXES - Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Net increase in stockholders' equity resulting from operations	$ 1,299	$ 1,522	$ 1,522
Net realized gains (losses) on investments, foreign currency and other transactions	75	(136)	(440)
Income not currently taxable	(186)	(203)	(157)
Income for tax but not book	361	233	60
Expenses not currently deductible	157	76	21
Realized gain/loss difference	(246)	17	60
Taxable income	1,460	1,509	1,066
Dividend income not taxable until collected	268	257	198
Dividend income collected	$ 149	$ 33	$ 11