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Assets and Liabilities Measured at Fair Value - Realized and Unrealized Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments $ (7) $ (32)
Change in fair value of exchangeable senior debentures realized gain (loss) (129) 169
Cumulative amount of gain in change in fair value 410  
1.75% Exchangeable Senior Debentures due 2046    
Realized and unrealized gains (losses) on financial instruments    
Gain (loss) on extinguishment of debt   25
Equity securities    
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments (2) (3)
Exchangeable senior debentures    
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments $ (5) (31)
Other Financial Instruments    
Realized and unrealized gains (losses) on financial instruments    
Realized and unrealized gains (losses) on financial instruments   $ 2