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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Cash flows from operating activities    
Net loss $ (493) $ (409)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 12 11
Reduction in the carrying amount of right-of-use assets 13 14
Stock-based compensation 106 89
Change in fair value of derivative liabilities 17 (7)
Accretion of discount on investments (1) (8)
Other operating activities (9) 0
Changes in operating assets and liabilities:    
Other current and non-current assets (2) 0
Operating lease liabilities (13) (14)
Other current and non-current liabilities (14) 38
Net cash used in operating activities (384) (286)
Cash flows from investing activities    
Purchases of property and equipment (56) (15)
Purchases of investments (474) (734)
Maturities and sales of investments 630 650
Net cash provided by (used in) investing activities 100 (99)
Cash flows from financing activities    
Proceeds from issuance of common stock 247 427
Payments for taxes on net settlement of equity incentive awards (44) (45)
Other financing activities 0 (2)
Net cash provided by financing activities 203 380
Net decrease in cash, cash equivalents, and restricted cash (81) (5)
Cash, cash equivalents, and restricted cash at beginning of the period 235 227
Cash, cash equivalents, and restricted cash at end of the period $ 154 $ 222