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Investments - Equity Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period $ 1,607  
Purchases 7  
Sales 0  
Gains (losses) on equity investments, net (29) $ 6
Other 13  
Balance, end of period 1,598  
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 (32)  
Other (3)  
Balance, end of period 202  
Nonmarketable Securities    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Balance, beginning of period 1,370  
Purchases 7  
Sales 0  
Gains (losses) on equity investments, net 3  
Other 16  
Balance, end of period $ 1,396