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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) shares in Millions, $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Statement of Financial Position [Abstract] |  |  |  |
Amortized cost of investments | $ 26,374.0 | [1] | $ 22,667.6 | [2]
Common stock, par value (in dollars per share) | $ 0.001 |  | $ 0.001 |
Common stock, shares authorized (in shares) | 1,000 |  | 1,000 |
Common stock, shares issued (in shares) | 672 |  | 582 |
Common stock, shares outstanding (in shares) | 672 |  | 582 |
[1] | As of December 31, 2024, the estimated net unrealized gain for federal tax purposes was $0.2 billion based on a tax cost basis of $26.5 billion. As of December 31, 2024, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.5 billion.
[2] | As of December 31, 2023, the estimated net unrealized loss for federal tax purposes was $0.4 billion based on a tax cost basis of $22.5 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.3 billion.

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