Stockholders' Equity (At-the-Market Offering Program) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	$ 700,000
Stock Issued During Period, Value, New Issues	$ 1,973,000	$ 1,967,000	$ 1,085,000
Stock Issued During Period, Price Per Share	$ 9.47	$ 9.73	$ 9.14
Additional Paid-in Capital [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues	$ 1,971,000	$ 1,965,000	$ 1,084,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues	208.2	202.1	118.8
Stock Issued During Period, Value, New Issues	$ 2,000	$ 2,000	$ 1,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

+ References + Details

AGNC Investment Corp. 10-K