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Prepaid expenses and other current assets (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 81 $ 62
Other current assets 21 30
Deferred equity raise costs 35 9
Prepaid expenses and other current assets $ 137 $ 101