Quarterly report [Sections 13 or 15(d)]

Fair Value Measurements - Gains (Losses) on Financial Instruments (Details)

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Fair Value Measurements - Gains (Losses) on Financial Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total $ 7 $ 82 $ 4 $ 100
Gain (loss) on specific credit risk $ (8) 18    
2.75% Exchangeable Senior Debentures | Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate (as a percent) 2.75%   2.75%  
Debt measured at fair value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total $ 7 80 $ 4 95
Gain (loss) on specific credit risk     (7) (13)
Cumulative loss on credit risk 16   16  
Other        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total $ 0 $ 2 $ 0 $ 5