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Goodwill and intangible assets - Expected Intangible Asset Amortization Expense (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
For year to be ended December 31, 2023 $ 2
For year to be ended December 31, 2024 2
For year to be ended December 31, 2025 1
For year to be ended December 31, 2026 1
Thereafter 3
Total remaining amortization of intangible assets $ 9