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Financial Instruments Cross-currency interest rate swap contracts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Foreign exchange derivative instruments | Derivatives Designated as Hedging Instruments: | Interest Expense        
Foreign Currency Fair Value Hedge Derivative [Line Items]        
Foreign exchange derivative instruments $ 5 $ 4 $ 10 $ 8