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Investments - Equity Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) In Equity Investments [Roll Forward]      
Marketable securities, beginning balance $ 506    
Nonmarketable securities, beginning balance 1,223    
Total equity investments, beginning balance 1,729    
Marketable securities, purchases 0    
Nonmarketable securities, purchases 42    
Total equity investments, purchases 42    
Marketable securities, sales (104)    
Nonmarketable securities, sales (21)    
Total equity investments, sales (125)    
Marketable securities, changes in fair value (28)    
Nonmarketable securities, changes in fair value (1)    
Total equity investments, changes in fair value (29) $ (61) $ (145)
Marketable securities, other (137)    
Nonmarketable securities, other 127    
Total equity investments, other (10)    
Marketable securities, ending balance 237 506  
Nonmarketable securities, ending balance 1,370 1,223  
Total equity investments, ending balance $ 1,607 $ 1,729