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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Mar. 31, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Amortized cost of investments $ 26,777.5 [1] $ 26,374.0 [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) 690 672
Common stock, shares outstanding (in shares) 690 672
[1] As of March 31, 2025, the estimated net unrealized gain for federal tax purposes was $0.4 billion based on a tax cost basis of $26.7 billion. As of March 31, 2025, 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 $1.3 billion.
[2] 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.