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Cash Equivalents and Investments - Schedule of Cash Equivalents and Short and Long-Term Investments (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 5,906 $ 5,339
Gross Unrealized Gains 1 13
Gross Unrealized Losses (23) 0
Fair Value 5,889 5,356
Cash Equivalents 796 1,013
Short-Term Investments 2,023 1,850
Long-Term Investments 3,070 2,493
Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 5,906 5,339
Gross Unrealized Gains 1 13
Gross Unrealized Losses (23) 0
Fair Value 5,884 5,352
Cash Equivalents 796 1,013
Short-Term Investments 2,018 1,846
Long-Term Investments 3,070 2,493
Level 1 | Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 3,634 3,561
Gross Unrealized Gains 0 7
Gross Unrealized Losses (12) 0
Fair Value 3,622 3,568
Cash Equivalents 796 1,013
Short-Term Investments 1,438 1,427
Long-Term Investments 1,388 1,128
Level 1 | Equity Securities    
Debt Securities, Available-for-Sale [Line Items]    
Fair Value 5 4
Cash Equivalents 0 0
Short-Term Investments 5 4
Long-Term Investments 0 0
Level 2 | Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 2,272 1,778
Gross Unrealized Gains 1 6
Gross Unrealized Losses (11) 0
Fair Value 2,262 1,784
Cash Equivalents 0 0
Short-Term Investments 580 419
Long-Term Investments 1,682 1,365
Money market funds | Level 1 | Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 796 1,010
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 796 1,010
Cash Equivalents 796 1,010
Short-Term Investments 0 0
Long-Term Investments 0 0
U.S. Treasury securities | Level 1 | Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 2,838 2,551
Gross Unrealized Gains 0 7
Gross Unrealized Losses (12) 0
Fair Value 2,826 2,558
Cash Equivalents 0 3
Short-Term Investments 1,438 1,427
Long-Term Investments 1,388 1,128
U.S. agency securities | Level 2 | Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 704 542
Gross Unrealized Gains 0 0
Gross Unrealized Losses (7) 0
Fair Value 697 542
Cash Equivalents 0 0
Short-Term Investments 0 0
Long-Term Investments 697 542
Commercial paper | Level 2 | Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 436 325
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 436 325
Cash Equivalents 0 0
Short-Term Investments 436 325
Long-Term Investments 0 0
Corporate debt securities | Level 2 | Debt Securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 1,132 911
Gross Unrealized Gains 1 6
Gross Unrealized Losses (4) 0
Fair Value 1,129 917
Cash Equivalents 0 0
Short-Term Investments 144 94
Long-Term Investments 985 823
Mutual funds | Level 1 | Equity Securities    
Debt Securities, Available-for-Sale [Line Items]    
Fair Value 5 4
Cash Equivalents 0 0
Short-Term Investments 5 4
Long-Term Investments $ 0 $ 0