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Investments - Equity Investments (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]  
Balance, beginning of period $ 1,607
Purchases 30
Sales 0
Changes in fair value 14
Other 34
Balance, end of period 1,685
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
Changes in fair value 11
Other 0
Balance, end of period 248
Nonmarketable Securities  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]  
Balance, beginning of period 1,370
Purchases 30
Sales 0
Changes in fair value 3
Other 34
Balance, end of period $ 1,437