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

Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details)

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Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Realized and unrealized gains (losses) on financial instruments      
Realized and unrealized gains (losses) on financial instruments $ (60) $ (61) $ 55
Change in fair value of exchangeable senior debentures realized gain (loss) (27) 50 341
Cumulative amount of gain in change in fair value 512    
1.75% Exchangeable Senior Debentures due 2046      
Realized and unrealized gains (losses) on financial instruments      
Gain (loss) on extinguishment of debt   $ 60  
Interest rate (as a percent)   1.75%  
Equity securities      
Realized and unrealized gains (losses) on financial instruments      
Realized and unrealized gains (losses) on financial instruments (22) $ (22) 13
Exchangeable senior debentures      
Realized and unrealized gains (losses) on financial instruments      
Realized and unrealized gains (losses) on financial instruments $ (38) (33) 324
Indemnification asset      
Realized and unrealized gains (losses) on financial instruments      
Realized and unrealized gains (losses) on financial instruments   (5) (273)
Other financial instruments      
Realized and unrealized gains (losses) on financial instruments      
Realized and unrealized gains (losses) on financial instruments   $ (1) $ (9)