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Financial Instruments and Risk Management (Credit Risk - Movement in the Allowance of Doubtful Accounts during the Year) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [abstract]    
Balance at start of period $ 8 $ 9
Additional allowance 5 1
Reversals 0 (2)
Balance at end of period $ 13 $ 8