Quarterly report [Sections 13 or 15(d)]

Assets and Liabilities Measured at Fair Value - Narrative (Details)

v3.26.1
Assets and Liabilities Measured at Fair Value - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Change in fair value of exchangeable senior debentures realized gain (loss) $ 17 $ 53  
Cumulative amount of gain in change in fair value $ 697   $ 772
4% Exchangeable Senior Debentures due 2029      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate (as a percent) 4.00%   4.00%
Repayment Of Long-Term Debt, Principal $ 59    
Repayment Of Long-Term Debt, Carrying Value 3    
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax $ 62    
3.75% Exchangeable Senior Debentures due 2030      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest rate (as a percent) 3.75%   3.75%
Repayment Of Long-Term Debt, Principal $ 14    
Repayment Of Long-Term Debt, Carrying Value 1    
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, before Tax $ 13