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Investments - Equity Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period     $ 1,607  
Purchases     16  
Sales     0  
Gains (losses) on equity investments, net $ 4 $ (13) (25) $ (7)
Other     40  
Balance, end of period 1,638   1,638  
Marketable Securities        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period     237  
Purchases     0  
Sales     0  
Gains (losses) on equity investments, net     (3)  
Other     0  
Balance, end of period 234   234  
Nonmarketable Securities        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance, beginning of period     1,370  
Purchases     16  
Sales     0  
Gains (losses) on equity investments, net     (22)  
Other     40  
Balance, end of period $ 1,404   $ 1,404