Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.4
Fair Value Measurements - Schedule of Gains (Losses) on Financial Instruments (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total $ 25 $ 115 $ (126)  
Loss on specific credit risk 11 27 6  
Gain on extinguishment of debt $ 0 12 $ 0  
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%      
Cash Convertible Senior Notes due 2023 | Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate (as a percent)     1.375% 1.375%
Gain on extinguishment of debt   12 $ 46  
2.125% Exchangeable Senior Debentures due 2048 | Senior Notes        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate (as a percent)     2.125%  
Equity securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total $ 0 0 $ (15)  
Debt measured at fair value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total 25 115 (5)  
Cumulative loss on credit risk 20      
Change in fair value of bond hedges        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total 0 0 (114)  
Other        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total $ 0 $ 0 $ 8