Debt and lines of credit - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
Commercial paper	$ 0	$ 0
Repayment of debt		750,000,000	$ 0
Interest and debt expense		128,000,000	116,000,000
Interest costs capitalized		4,000,000	$ 6,000,000
Notes due 2025 at 1.375%
Debt Instrument [Line Items]
Repayment of debt	750,000,000
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000	$ 1,000,000,000