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Loans payable and other financial liabilities - Narrative (Details)			1 Months Ended	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) shares	Sep. 19, 2023 USD ($) shares	May 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jan. 14, 2021 USD ($)	Aug. 31, 2018 USD ($)	Aug. 24, 2018
Debt Instrument [Line Items]
Gain in interest income and other financial gains					$ 8,000,000		$ 8,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing under the facility	$ 0			$ 0				$ 0
Revolving Credit Facility | Subsidiaries
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 400,000,000
2.375% Sustainability Notes due 2026
Debt Instrument [Line Items]
Convertible senior notes, interest rate												2.375%
Face amount												$ 400,000,000
Total amount paid			$ 38,000,000
2031 Notes
Debt Instrument [Line Items]
Convertible senior notes, interest rate												3.125%
Face amount												$ 700,000,000
Repurchased principal amount			44,000,000
2026 Sustainability Notes
Debt Instrument [Line Items]
Repurchased principal amount			$ 2,000,000
Initial Issuance - 2028 Convertible Senior Notes | Convertible Senior Notes
Debt Instrument [Line Items]
Convertible senior notes, interest rate														2.00%
2028 Notes | Convertible Senior Notes
Debt Instrument [Line Items]
Convertible senior notes, interest rate													2.00%
Face amount													$ 880,000,000
Conversion ratio		0.0022952
Increase in conversion ratio		0.0000399
Debt instrument outstanding	88,000,000			88,000,000				88,000,000		$ 439,000,000
Debt issuance costs	1,000,000			1,000,000				1,000,000		$ 3,000,000
Amortization of debt issuance costs				7,000,000		$ 2,000,000		7,000,000	$ 2,000,000
2028 Notes | Convertible Senior Notes | Notes Converted Into Non Cash Transactions
Debt Instrument [Line Items]
Converted shares (in shares) | shares		869,692
Debt instrument outstanding	60,000,000			$ 60,000,000				$ 60,000,000
Total principal amount	$ 351,000,000	$ 379,000,000
2028 Notes | Convertible Senior Notes | Notes Converted Into Non Cash Transactions | Common stock
Debt Instrument [Line Items]
Converted shares (in shares) | shares	806,629
2028 Notes | Convertible Senior Notes | Notes Converted Into Non Cash Transactions | 2028 Notes Converted
Debt Instrument [Line Items]
Non-cash transaction	$ 350,000,000
2028 Notes | Convertible Senior Notes | Shares Received From 2028 Notes Capped Call Transactions | Common stock
Debt Instrument [Line Items]
Converted shares (in shares) | shares		289,675

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