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Details of Income Statement Items (Other Income and Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other income and expenses [Abstract]      
Past service cost $ 11 $ 5 $ 7
Capital gain 0 12 841
Reversal of Impairment of fixed assets 0 10 0
Reversal of provision for legal claims 0 7 0
Other 9 6 11
Other income recorded in the income statements 20 40 859
Impairment of fixed assets 90 0 19
Provision for historical waste removal and site closure costs 83 7 18
Provision for early retirement and dismissal of employees 78 5 7
Provision For Legal Claims 0 14 31
Environment related provisions 0 0 1
Other 5 4 8
Other expenses recorded in the income statements $ 256 $ 30 $ 84