Costs and expenses by nature (Details 1) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Costs And Expenses By Nature
Personnel	$ 59	$ 52	$ 121	$ 119
Services	33	45	60	79
Depreciation and amortization	7	9	31	19
Other	32	31	64	60
Total	$ 131	$ 137	$ 276	$ 277

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

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