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Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Cash flows from operating activities    
Net loss $ (409) $ (347)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 11 11
Reduction in the carrying amount of right-of-use assets 14 14
Stock-based compensation 89 74
Change in fair value of derivative liabilities (7) (13)
Accretion of discount on investments (8) (14)
Other operating activities 0 (1)
Changes in operating assets and liabilities:    
Other current and non-current assets 0 (10)
Operating lease liabilities (14) (13)
Other current and non-current liabilities 38 (27)
Net cash used in operating activities (286) (326)
Cash flows from investing activities    
Purchases of property and equipment (15) (19)
Purchases of investments (734) (180)
Maturities and sales of investments 650 420
Net cash (used in) provided by investing activities (99) 221
Cash flows from financing activities    
Proceeds from issuance of common stock 427 8
Payments for taxes on net settlement of equity incentive awards (45) (1)
Other financing activities (2) (1)
Net cash provided by financing activities 380 6
Net decrease in cash, cash equivalents, and restricted cash (5) (99)
Cash, cash equivalents, and restricted cash at beginning of the period 227 518
Cash, cash equivalents, and restricted cash at end of the period $ 222 $ 419