Quarterly report pursuant to Section 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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total $ 22 $ (55) $ 122 $ (86)  
Gain on retirement of debt 0 $ 27 0 27  
Cash Convertible Senior Notes due 2023 | Senior Notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Gain on retirement of debt       $ 42  
Stated interest rate (as a percent)   1.375%   1.375% 1.375%
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%   2.125%  
Equity securities          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total 0 $ (11) 0 $ (11)  
Debt measured at fair value          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total 22 (28) 117 34  
Loss on specific credit risk 16 15 30 27  
Cumulative loss on credit risk 99   99    
Change in fair value of bond hedges          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total 0 (15) 0 (114)  
Other          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Total $ 0 $ (1) $ 5 $ 5