Debt and lines of credit - Additional Information (Details)	1 Months Ended	3 Months Ended
Mar. 31, 2023 USD ($) seriesOfDebt	Mar. 31, 2023 USD ($) seriesOfDebt	Mar. 31, 2022 USD ($)
Debt Instrument [Line Items]
Commercial paper	$ 0	$ 0
Proceeds from issuance of long-term debt		1,397,000,000	$ 0
Interest and debt expense		$ 68,000,000	$ 52,000,000
Notes due 2033 at 4.90%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	4.90%	4.90%
Notes due 2053 at 5.00%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	5.00%	5.00%
Senior unsecured notes
Debt Instrument [Line Items]
Number of series of debt issued \| seriesOfDebt	2	2
Principal amount	$ 1,400,000,000	$ 1,400,000,000
Debt issuance costs	11,000,000	11,000,000
Proceeds from issuance of long-term debt	1,400,000,000
Senior unsecured notes \| Notes due 2033 at 4.90%
Debt Instrument [Line Items]
Principal amount	$ 750,000,000	$ 750,000,000
Long-term debt stated interest rate (in percentage)	4.90%	4.90%
Senior unsecured notes \| Notes due 2053 at 5.00%
Debt Instrument [Line Items]
Principal amount	$ 650,000,000	$ 650,000,000
Long-term debt stated interest rate (in percentage)	5.00%	5.00%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000	$ 1,000,000,000

Debt Instrument, Number of Series Issued

No definition available.

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Interest and debt related expenses associated with nonoperating financing activities of the entity.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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