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Debt and lines of credit - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2022	Apr. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Commercial paper			$ 0		$ 0
Proceeds from issuance of long-term debt					695,000,000	$ 1,495,000,000
Retirement of debt		$ 500,000,000			500,000,000	550,000,000
Interest and debt expense			$ 53,000,000	$ 45,000,000	$ 154,000,000	$ 135,000,000
Notes due 2032 at 3.65%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)			3.65%		3.65%
Notes due 2052 at 4.10%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)			4.10%		4.10%
Senior unsecured notes
Debt Instrument [Line Items]
Principal amount	$ 700,000,000
Payments of debt issuance costs	3,000,000
Proceeds from issuance of long-term debt	695,000,000
Senior unsecured notes \| Notes due 2032 at 3.65%
Debt Instrument [Line Items]
Principal amount	$ 400,000,000
Long-term debt stated interest rate (in percentage)	3.65%
Senior unsecured notes \| Notes due 2052 at 4.10%
Debt Instrument [Line Items]
Principal amount	$ 300,000,000
Long-term debt stated interest rate (in percentage)	4.10%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000		$ 1,000,000,000