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Summary of significant accounting policies - Assets, Liabilities and Net Assets of Company's Argentinean Subsidiaries (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Subsidiary or Equity Method Investee [Line Items]
Assets	$ 15,243	$ 13,736
Liabilities	12,991	11,909
Argentinean Subsidiaries
Subsidiary or Equity Method Investee [Line Items]
Assets	3,696	3,238
Liabilities	2,486	2,419
Net Assets	$ 1,210	$ 819

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