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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Debt and lines of credit - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Apr. 27, 2022	Mar. 31, 2022	Mar. 31, 2021
Debt Instrument [Line Items]
Commercial paper		$ 0
Interest and debt expense		52,000,000	$ 46,000,000
Retirement of debt		0	$ 550,000,000
Subsequent Event
Debt Instrument [Line Items]
Retirement of debt	$ 500,000,000
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000,000,000