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Contract revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Capitalized Contract Cost [Line Items]
Contract with customer, asset	$ 2,500			$ 2,500		$ 2,500
Contract assets representing accrued revenues not yet billed	52			52		34
Contract with customer, liability	198			198		171
Contract with customer, liability, revenue recognized	73			103
Incremental costs for obtaining contracts
Capitalized Contract Cost [Line Items]
Capitalized contract costs	47			47		44
Capitalized contract cost, amortization	3	$ 4	$ 4	10	$ 11
Costs to fulfill contract
Capitalized Contract Cost [Line Items]
Capitalized contract costs	$ 120			$ 120		$ 98

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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