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Debt and lines of credit - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 22, 2020	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Commercial paper		$ 0
Proceeds from issuance of long-term debt		749,000,000	$ 743,000,000
Interest and debt expense		$ 45,000,000	$ 38,000,000
Notes due 2020 at 1.75%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)		1.75%
Notes due 2020 at 1.75% \| Subsequent Event
Debt Instrument [Line Items]
Retirement of debt	$ 500,000,000
Long-term debt stated interest rate (in percentage)	1.75%
Notes due 2025 at 1.375%
Debt Instrument [Line Items]
Principal amount		$ 750,000,000
Payments of debt issuance costs		4,000,000
Proceeds from issuance of long-term debt		$ 749,000,000
Long-term debt stated interest rate (in percentage)		1.375%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 2,000,000,000