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Debt (Tables)
9 Months Ended
Sep. 30, 2025
Debt  
Schedule of debt

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Outstanding

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principal

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Carrying value

 

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September 30,

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September 30,

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December 31,

 

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2025

    

2025

        

2024

 

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amounts in millions

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Margin Loan Facility

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$

840

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840

 

790

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3.125% Exchangeable Senior Debentures due 2053

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​

965

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952

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951

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3.125% Exchangeable Senior Debentures due 2054

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—

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—

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946

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Total debt

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$

1,805

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1,792

 

2,687

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Debt classified as current

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(102)

 

—

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Total long-term debt

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$

1,690

 

2,687

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