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Details of Income Statement Items (Other Income and Expenses) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other income and expenses [Abstract]      
Capital gain $ 12 $ 841 $ 54
Reversal of Impairment of fixed assets 10 0 0
Reversal of provision for legal claims 7 0 0
Past service cost 5 7 0
Retroactive electricity charges 0 0 6
Insurance compensation 0 0 30
Other 6 11 19
Other income recorded in the income statements 40 859 109
Provision For Legal Claims 14 31 31
Impairment of fixed assets 0 19 32
Provision for historical waste removal and site closure costs 7 18 0
Provision for early retirement and dismissal of employees 5 7 20
Environment related provisions 0 1 7
Other 4 8 0
Other expenses recorded in the income statements $ 30 $ 84 $ 90