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Debt - Notes payable and bank lines (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Uncommitted and committed bank lines
Debt
Weighted average interest rate (as a percent)	6.47%	7.34%
Uncommitted bank lines
Debt
Lines of credit	$ 139	$ 150
Uncommitted bank lines | Denominated in foreign currencies
Debt
Lines of credit	83	70
Uncommitted bank lines | South African Rand
Debt
Lines of credit	62	57
Committed bank lines
Debt
Lines of credit	175	$ 105
Maximum capacity	$ 450

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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.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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